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19. 5 • capacitors and dielectrics 833 a system composed of two identical, parallel conducting plates separated by a distance, as in figure 19. 13, is called a parallel plate capacitor. it is easy to see the relationship between the voltage and the stored charge for a parallel plate capacitor, as shown in figure 19. 13... | openstax_college_physics_2e-web_7zesafu | [
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is the amount of charge stored per volt, or 19. 45 19. 46 19. 47 19. 48 | openstax_college_physics_2e-web_7zesafu | [
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19. 49 834 19 • electric potential and electric field access for free at openstax. org the unit of capacitance is the farad ( f ), named for michael faraday ( 1791 – 1867 ), an english scientist who contributed to the fields of electromagnetism and electrochemistry. since capacitance is charge per unit voltage, we see ... | openstax_college_physics_2e-web_7zesafu | [
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are together, the greater the attraction of the opposite charges on them. so should be greater for smaller. capacitance capacitance is the amount of charge stored per volt, or 19. 50 19. 51 | openstax_college_physics_2e-web_7zesafu | [
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19. 5 • capacitors and dielectrics 835 figure 19. 15 parallel plate capacitor with plates separated by a distance. each plate has an area. it can be shown that for a parallel plate capacitor there are only two factors ( and ) that affect its capacitance. the capacitance of a parallel plate capacitor in equation form is... | openstax_college_physics_2e-web_7zesafu | [
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19. 54 836 19 • electric potential and electric field access for free at openstax. org discussion for ( a ) this small value for the capacitance indicates how difficult it is to make a device with a large capacitance. special techniques help, such as using very large area thin foils placed close together. solution for ... | openstax_college_physics_2e-web_7zesafu | [
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greater electric fields than air before breaking down. there is another benefit to using a dielectric in a capacitor. depending on the material used, the capacitance is greater than that given by the equation by a factor, called the dielectric constant. a parallel plate capacitor with a dielectric between its plates ha... | openstax_college_physics_2e-web_7zesafu | [
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2. 1 water 80 — table 19. 1 dielectric constants and dielectric strengths for various materials at 20ºc note also that the dielectric constant for air is very close to 1, so that air - filled capacitors act much like those with vacuum between their plates except that the air can become conductive if the electric field ... | openstax_college_physics_2e-web_7zesafu | [
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19. 59 838 19 • electric potential and electric field access for free at openstax. org microscopically, how does a dielectric increase capacitance? polarization of the insulator is responsible. the more easily it is polarized, the greater its dielectric constant. water, for example, is a polar molecule because one end ... | openstax_college_physics_2e-web_7zesafu | [
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end on charges in the dielectric, there are fewer of them going from one side of the capacitor to the other. so the electric field strength is less than if there were a vacuum between the plates, even though the same charge is on the plates. the voltage between the plates is, so it too is reduced by the dielectric. thu... | openstax_college_physics_2e-web_7zesafu | [
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19. 5 • capacitors and dielectrics 839 figure 19. 17 artist ’ s conception of a polarized atom. the orbits of electrons around the nucleus are shifted slightly by the external charges ( shown exaggerated ). the resulting separation of charge within the atom means that it is polarized. note that the unlike charge is now... | openstax_college_physics_2e-web_7zesafu | [
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brought out in the previous chapter, polar water provides a shield or screening of the electric fields in the highly charged molecules of interest in biological systems. figure 19. 18 artist ’ s conception of a water molecule. there is an inherent separation of charge, and so water is a polar molecule. electrons in the... | openstax_college_physics_2e-web_7zesafu | [
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19. 6 capacitors in series and parallel learning objectives by the end of this section, you will be able to : • derive expressions for total capacitance in series and in parallel. • identify series and parallel parts in the combination of connection of capacitors. • calculate the effective capacitance in series and par... | openstax_college_physics_2e-web_7zesafu | [
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19. 6 • capacitors in series and parallel 841 figure 19. 19 ( a ) capacitors connected in series. the magnitude of the charge on each plate is. ( b ) an equivalent capacitor has a larger plate separation. series connections produce a total capacitance that is less than that of any of the individual capacitors. we can f... | openstax_college_physics_2e-web_7zesafu | [
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19. 63 842 19 • electric potential and electric field access for free at openstax. org example 19. 9 what is the series capacitance? find the total capacitance for three capacitors connected in series, given their individual capacitances are 1. 000, 5. 000, and 8. 000. strategy with the given information, the total cap... | openstax_college_physics_2e-web_7zesafu | [
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19. 6 • capacitors in series and parallel 843 figure 19. 20 ( a ) capacitors in parallel. each is connected directly to the voltage source just as if it were all alone, and so the total capacitance in parallel is just the sum of the individual capacitances. ( b ) the equivalent capacitor has a larger plate area and can... | openstax_college_physics_2e-web_7zesafu | [
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19. 70 total capacitance in parallel, total capacitance in parallel 844 19 • electric potential and electric field access for free at openstax. org example 19. 10 a mixture of series and parallel capacitance find the total capacitance of the combination of capacitors shown in figure 19. 21. assume the capacitances in f... | openstax_college_physics_2e-web_7zesafu | [
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19. 7 energy stored in capacitors learning objectives by the end of this section, you will be able to : • list some uses of capacitors. • express in equation form the energy stored in a capacitor. • explain the function of a defibrillator. most of us have seen dramatizations in which medical personnel use a defibrillat... | openstax_college_physics_2e-web_7zesafu | [
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19. 7 • energy stored in capacitors 845 figure 19. 22 energy stored in the large capacitor is used to preserve the memory of an electronic calculator when its batteries are charged. ( credit : kucharek, wikimedia commons ) energy stored in a capacitor is electrical potential energy, and it is thus related to the charge... | openstax_college_physics_2e-web_7zesafu | [
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##llation. the application of a large shock of electrical energy can terminate the arrhythmia and allow the body ’ s pacemaker to resume normal patterns. today it is common for ambulances to carry a defibrillator, which also uses an electrocardiogram to analyze the patient ’ s heartbeat pattern. automated external defi... | openstax_college_physics_2e-web_7zesafu | [
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19. 76 846 19 • electric potential and electric field access for free at openstax. org figure 19. 23 automated external defibrillators are found in many public places. these portable units provide verbal instructions for use in the important first few minutes for a person suffering a cardiac attack. ( credit : owain da... | openstax_college_physics_2e-web_7zesafu | [
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19. 7 • energy stored in capacitors 847 glossary capacitance amount of charge stored per unit volt capacitor a device that stores electric charge defibrillator a machine used to provide an electrical shock to a heart attack victim's heart in order to restore the heart's normal rhythmic pattern dielectric an insulating ... | openstax_college_physics_2e-web_7zesafu | [
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points a and b is where is the distance from a to b, or the distance between the plates. • in equation form, the general relationship between voltage and electric field is where is the distance over which the change in potential,, takes place. the minus sign tells us that points in the direction of decreasing potential... | openstax_college_physics_2e-web_7zesafu | [
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19. 5 capacitors and dielectrics • a capacitor is a device used to store charge. • the amount of charge a capacitor can store depends on two major factors — the voltage applied 848 19 • glossary access for free at openstax. org and the capacitor ’ s physical characteristics, such as its size. • the capacitance is the a... | openstax_college_physics_2e-web_7zesafu | [
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voltage or potential difference? 2. if the voltage between two points is zero, can a test charge be moved between them with zero net work being done? can this necessarily be done without exerting a force? explain. 3. what is the relationship between voltage and energy? more precisely, what is the relationship between p... | openstax_college_physics_2e-web_7zesafu | [
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19. 5 capacitors and dielectrics 14. does the capacitance of a device depend on the applied voltage? what about the charge stored in it? 15. use the characteristics of the coulomb force to explain why capacitance should be proportional to the plate area of a capacitor. similarly, explain why capacitance should be inver... | openstax_college_physics_2e-web_7zesafu | [
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, a layer of negative charge on the inside, and thus a voltage across the cell membrane. the membrane is normally impermeable to ( sodium ions ). 19. 6 capacitors in series and parallel 21. if you wish to store a large amount of energy in a capacitor bank, would you connect capacitors in series or parallel? explain. 19... | openstax_college_physics_2e-web_7zesafu | [
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19. 1 electric potential energy : potential difference 1. find the ratio of speeds of an electron and a negative hydrogen ion ( one having an extra electron ) accelerated through the same voltage, assuming non - relativistic final speeds. take the mass of the hydrogen ion to be × 2. an evacuated tube uses an accelerati... | openstax_college_physics_2e-web_7zesafu | [
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the tree by the expansion of the boiling steam. 8. integrated concepts a 12. 0 v battery - operated bottle warmer heats 50. 0 g of glass, of baby formula, and of aluminum from to. ( a ) how much charge is moved by the battery? ( b ) how many electrons per second flow if it takes 5. 00 min to warm the formula? ( hint : ... | openstax_college_physics_2e-web_7zesafu | [
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25. 0 m / s, make it climb a high hill, and then cause it to travel at a constant 25. 0 m / s by exerting a force for an hour. 10. integrated concepts fusion probability is greatly enhanced when appropriate nuclei are brought close together, but mutual coulomb repulsion must be overcome. this can be done using the kine... | openstax_college_physics_2e-web_7zesafu | [
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b ) the plate with the lowest potential is taken to be at zero volts. what is the potential 1. 00 cm from that plate ( and | openstax_college_physics_2e-web_7zesafu | [
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3. 00 cm from the other )? 16. how far apart are two conducting plates that have an electric field strength of between them, if their potential difference is 15. 0 kv? 17. ( a ) will the electric field strength between two parallel conducting plates exceed the breakdown strength for air ( ) if the plates are separated ... | openstax_college_physics_2e-web_7zesafu | [
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10. 0 cm, and one of them is taken to be at zero volts. ( a ) what is the electric field strength between them, if the potential 8. 00 cm from the zero volt plate ( and 2. 00 cm from the other ) is 450 v? ( b ) what is the voltage between the plates? 21. find the maximum potential difference between two parallel conduc... | openstax_college_physics_2e-web_7zesafu | [
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1. 00 c. at what distance from its center is the potential 5. 00 mv? ( b ) what does your answer imply about the practical aspect of isolating such a large charge? 27. how far from a point charge will the potential be 100 v? at what distance will it be 28. what are the sign and magnitude of a point charge that produces... | openstax_college_physics_2e-web_7zesafu | [
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1. 00 mv? ( c ) an oxygen atom with three missing electrons is released near the van de graaff generator. what is its energy in mev at this distance? 32. an electrostatic paint sprayer has a 0. 200 - m - diameter metal sphere at a potential of 25. 0 kv that repels paint droplets onto a grounded object. ( a ) what charg... | openstax_college_physics_2e-web_7zesafu | [
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19. 4 equipotential lines 36. ( a ) sketch the equipotential lines near a point charge +. indicate the direction of increasing potential. ( b ) do the same for a point charge. 37. sketch the equipotential lines for the two equal positive charges shown in figure 19. 25. indicate the direction of increasing potential. fi... | openstax_college_physics_2e-web_7zesafu | [
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its non - uniform charge distribution. ( b ) sketch equipotential lines surrounding the insulator. indicate the direction of increasing potential. figure 19. 29 a charged insulating rod such as might be used in a classroom demonstration. 44. the naturally occurring electrical field on the ground to an open sky point 3.... | openstax_college_physics_2e-web_7zesafu | [
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19. 5 capacitors and dielectrics 46. what charge is stored in a capacitor when 120 v is applied to it? 47. find the charge stored when 5. 50 v is applied to an 8. 00 pf capacitor. 48. what charge is stored in the capacitor in example 19. 8? 49. calculate the voltage applied to a capacitor when it holds of charge. 50. w... | openstax_college_physics_2e-web_7zesafu | [
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assumptions are responsible or inconsistent? 19. 6 capacitors in series and parallel 57. find the total capacitance of the combination of capacitors in figure 19. 31. figure 19. 31 a combination of series and parallel connections of capacitors. 58. suppose you want a capacitor bank with a total capacitance of 0. 750 f ... | openstax_college_physics_2e-web_7zesafu | [
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1. 50 mf capacitors. what is the smallest number you could hook together to achieve your goal, and how would you connect them? 59. what total capacitances can you make by connecting a and an capacitor together? 60. find the total capacitance of the combination of capacitors shown in figure 19. 32. figure 19. 32 a combi... | openstax_college_physics_2e-web_7zesafu | [
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... |
19. 7 energy stored in capacitors 63. ( a ) what is the energy stored in the capacitor of a heart defibrillator charged to? ( b ) find the amount of stored charge. 64. in open heart surgery, a much smaller amount of energy will defibrillate the heart. ( a ) what voltage is applied to the capacitor of a heart defibrilla... | openstax_college_physics_2e-web_7zesafu | [
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be considered are the applied voltage and whether it should vary with energy to be delivered, the range of energies involved, and the capacitance of the defibrillator. you may also wish to consider the much smaller energy needed for defibrillation during open - heart surgery as a variation on this problem. 70. unreason... | openstax_college_physics_2e-web_7zesafu | [
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20. 7 nerve conduction – electrocardiograms the flicker of numbers on a handheld calculator, nerve impulses carrying signals of vision to the brain, an ultrasound device sending a signal to a computer screen, the brain sending a message for a baby to twitch its toes, an electric train pulling its load over a mountain p... | openstax_college_physics_2e-web_7zesafu | [
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20. 1 current learning objectives by the end of this section, you will be able to : • define electric current, ampere, and drift velocity • describe the direction of charge flow in conventional current. • use drift velocity to calculate current and vice versa. electric current electric current is defined to be the rate... | openstax_college_physics_2e-web_7zesafu | [
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we rearrange the definition of current and use the given values of charge and current to find the time required. solution for ( a ) entering the given values for charge and time into the definition of current gives 20. 1 20. 2 | openstax_college_physics_2e-web_7zesafu | [
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20. 3 858 20 • electric current, resistance, and ohm's law access for free at openstax. org discussion for ( a ) this large value for current illustrates the fact that a large charge is moved in a small amount of time. the currents in these “ starter motors ” are fairly large because large frictional forces need to be ... | openstax_college_physics_2e-web_7zesafu | [
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a simple electric circuit. a closed path for current to flow through is supplied by conducting wires connecting a load to the terminals of a battery. ( b ) in this schematic, the battery is represented by the two parallel red lines, conducting wires are shown as straight lines, and the zigzag represents the load. the s... | openstax_college_physics_2e-web_7zesafu | [
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20. 1 • current 859 charges, or both may move. in metal wires, for example, current is carried by electrons — that is, negative charges move. in ionic solutions, such as salt water, both positive and negative charges move. this is also true in nerve cells. a van de graaff generator used for nuclear research can produce... | openstax_college_physics_2e-web_7zesafu | [
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electrons per second pass through it? strategy the current calculated in the previous example was defined for the flow of positive charge. for electrons, the magnitude is the same, but the sign is opposite,. since each electron has a making connections : take - home investigation — electric current illustration find a ... | openstax_college_physics_2e-web_7zesafu | [
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charges that make up the current move much more slowly on average, typically drifting at speeds on the order of. how do we reconcile these two speeds, and what does it tell us about standard conductors? the high speed of electrical signals results from the fact that the force between charges acts rapidly at a distance.... | openstax_college_physics_2e-web_7zesafu | [
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. 20. 5 × × × × 20. 6 | openstax_college_physics_2e-web_7zesafu | [
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20. 1 • current 861 figure 20. 6 free electrons moving in a conductor make many collisions with other electrons and atoms. the path of one electron is shown. the average velocity of the free charges is called the drift velocity,, and it is in the direction opposite to the electric field for electrons. the collisions no... | openstax_college_physics_2e-web_7zesafu | [
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average distance in a time. rearranging terms gives where is the current through a wire of cross - sectional area made of a material with a free charge density. the carriers of the current each have charge and move with a drift velocity of magnitude. conduction of electricity and heat good electrical conductors are oft... | openstax_college_physics_2e-web_7zesafu | [
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20. 8 862 20 • electric current, resistance, and ohm's law access for free at openstax. org figure 20. 7 all the charges in the shaded volume of this wire move out in a time, having a drift velocity of magnitude. see text for further discussion. note that simple drift velocity is not the entire story. the speed of an e... | openstax_college_physics_2e-web_7zesafu | [
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the given diameter, 2. 053 mm. we are given the density of copper, and the periodic table shows that the atomic mass of copper is 63. 54 g / mol. we can use these two quantities along with avogadro ’ s number, to determine the number of free electrons per cubic meter. solution first, calculate the density of free elect... | openstax_college_physics_2e-web_7zesafu | [
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20. 2 ohm ’ s law : resistance and simple circuits learning objectives by the end of this section, you will be able to : • explain the origin of ohm ’ s law. • calculate voltages, currents, or resistances with ohm ’ s law. • explain what an ohmic material is. • describe a simple circuit. what drives current? we can thi... | openstax_college_physics_2e-web_7zesafu | [
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##m ’ s law ( like hooke ’ s law ) is not universally valid. the many substances for which ohm ’ s law holds are called ohmic. these include good conductors like copper and aluminum, and some poor conductors under certain circumstances. ohmic materials have a resistance that is independent of voltage and current. an ob... | openstax_college_physics_2e-web_7zesafu | [
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20. 14 864 20 • electric current, resistance, and ohm's law access for free at openstax. org figure 20. 8 shows the schematic for a simple circuit. a simple circuit has a single voltage source and a single resistor. the wires connecting the voltage source to the resistor can be assumed to have negligible resistance, or... | openstax_college_physics_2e-web_7zesafu | [
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composed, as will be seen in resistance and resistivity. additional insight is gained by solving for yielding this expression for can be interpreted as the voltage drop across a resistor produced by the flow of current. the phrase drop is often used for this voltage. for instance, the headlight in example 20. 4 has an ... | openstax_college_physics_2e-web_7zesafu | [
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20. 2 • ohm ’ s law : resistance and simple circuits 865 resistor, since, and the same flows through each. thus the energy supplied by the voltage source and the energy converted by the resistor are equal. ( see figure 20. 9. ) figure 20. 9 the voltage drop across a resistor in a simple circuit equals the voltage outpu... | openstax_college_physics_2e-web_7zesafu | [
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20. 3 resistance and resistivity learning objectives by the end of this section, you will be able to : • explain the concept of resistivity. • use resistivity to calculate the resistance of specified configurations of material. • use the thermal coefficient of resistivity to calculate the change of resistance with temp... | openstax_college_physics_2e-web_7zesafu | [
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in the table are separated into categories of conductors, semiconductors, and insulators, based on broad groupings of resistivities. conductors have the smallest resistivities, and insulators have the largest ; semiconductors have intermediate resistivities. conductors have varying but large free charge densities, wher... | openstax_college_physics_2e-web_7zesafu | [
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20. 3 • resistance and resistivity 867 material resistivity ( ) constantan ( cu, ni alloy ) mercury nichrome ( ni, fe, cr alloy ) semiconductors1 carbon ( pure ) carbon germanium ( pure ) germanium silicon ( pure ) silicon insulators amber glass lucite mica quartz ( fused ) rubber ( hard ) sulfur teflon wood table 20. ... | openstax_college_physics_2e-web_7zesafu | [
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metal make more collisions, effectively making the resistivity higher. over relatively small temperature changes ( about or less ), resistivity varies with temperature change as expressed in the following equation where is the original resistivity and is the temperature coefficient of resistivity. ( see the values of i... | openstax_college_physics_2e-web_7zesafu | [
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20. 3 • resistance and resistivity 869 figure 20. 11 the resistance of a sample of mercury is zero at very low temperatures — it is a superconductor up to about 4. 2 k. above that critical temperature, its resistance makes a sudden jump and then increases nearly linearly with temperature. material coefficient ( 1 / °c ... | openstax_college_physics_2e-web_7zesafu | [
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see figure 20. 12. ) one of the most common is the thermistor, a semiconductor crystal with a strong temperature dependence, the resistance of which is measured to obtain its temperature. the device is small, so that it quickly comes into thermal equilibrium with the part of a person it touches. figure 20. 12 these fam... | openstax_college_physics_2e-web_7zesafu | [
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20. 4 electric power and energy learning objectives by the end of this section, you will be able to : • calculate the power dissipated by a resistor and power supplied by a power supply. • calculate the cost of electricity under various circumstances. power in electric circuits power is associated by many people with e... | openstax_college_physics_2e-web_7zesafu | [
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both the voltage involved and the charge moved. this is expressed most simply as 872 20 • electric current, resistance, and ohm's law access for free at openstax. org, where is the charge moved and is the voltage ( or more precisely, the potential difference the charge moves through ). power is the rate at which energy... | openstax_college_physics_2e-web_7zesafu | [
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when the voltage is doubled to a 25 - w bulb, its power nearly quadruples to about 100 w, burning it out. if the bulb ’ s resistance remained constant, its power would be exactly 100 w, but at the higher temperature its resistance is higher, too. example 20. 7 calculating power dissipation and current : hot and cold po... | openstax_college_physics_2e-web_7zesafu | [
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20. 4 • electric power and energy 873 discussion for ( a ) the 30 w dissipated by the hot headlight is typical. but the 411 w when cold is surprisingly higher. the initial power quickly decreases as the bulb ’ s temperature increases and its resistance increases. strategy and solution for ( b ) the current when the bul... | openstax_college_physics_2e-web_7zesafu | [
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can be reduced either by reducing the time of use or by reducing the power consumption of that appliance or fixture. this will not only reduce the cost, but it will also result in a reduced impact on the environment. improvements to lighting are some of the fastest ways to reduce the electrical energy used in a home or... | openstax_college_physics_2e-web_7zesafu | [
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20. 34 making connections : energy, power, and time the relationship is one that you will find useful in many different contexts. the energy your body uses in exercise is related to the power level and duration of your activity, for example. the amount of heating by a power source is related to the power level and time... | openstax_college_physics_2e-web_7zesafu | [
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that the investment cost will be 1 / 10 of the bulb cost for that time period of use, or 0. 1 ( $ 1. 50 ) = $ 0. 15. therefore, the total cost will be $ 1. 95 for 1000 hours. discussion therefore, it is much cheaper to use the cfls, even though the initial investment is higher. the increased cost of labor that a busine... | openstax_college_physics_2e-web_7zesafu | [
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20. 37 making connections : take - home experiment — electrical energy use inventory 1 ) make a list of the power ratings on a range of appliances in your home or room. explain why something like a toaster has a higher rating than a digital clock. estimate the energy consumed by these appliances in an average day ( by ... | openstax_college_physics_2e-web_7zesafu | [
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20. 5 • alternating current versus direct current 875 alternating current most of the examples dealt with so far, and particularly those utilizing batteries, have constant voltage sources. once the current is established, it is thus also a constant. direct current ( dc ) is the flow of electric charge in only one direc... | openstax_college_physics_2e-web_7zesafu | [
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38 | openstax_college_physics_2e-web_7zesafu | [
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20. 39 876 20 • electric current, resistance, and ohm's law access for free at openstax. org current in the resistor alternates back and forth just like the driving voltage, since. if the resistor is a fluorescent light bulb, for example, it brightens and dims 120 times per second as the current repeatedly goes through... | openstax_college_physics_2e-web_7zesafu | [
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. for example, most household electricity is 120 v ac, which means that is 120 v. the common 10 - a circuit breaker will interrupt a sustained greater than 10 a. your 1. 0 - kw microwave oven consumes, and so on. you can think of these rms and average values as the equivalent dc values for a simple resistive circuit. m... | openstax_college_physics_2e-web_7zesafu | [
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20. 5 • alternating current versus direct current 877 to summarize, when dealing with ac, ohm ’ s law and the equations for power are completely analogous to those for dc, but rms and average values are used for ac. thus, for ac, ohm ’ s law is written the various expressions for ac power are and example 20. 9 peak vol... | openstax_college_physics_2e-web_7zesafu | [
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20. 50 | openstax_college_physics_2e-web_7zesafu | [
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20. 51 878 20 • electric current, resistance, and ohm's law access for free at openstax. org can be transmitted with much smaller power losses than low voltages, as we shall see. ( see figure 20. 17. ) for safety reasons, the voltage at the user is reduced to familiar values. the crucial factor is that it is much easie... | openstax_college_physics_2e-web_7zesafu | [
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at 25 kv, then a current of 4000 a would have been needed. this would result in a power loss in the lines of 16. 0 mw, or 16. 0 % rather than 0. 250 %. the lower the voltage, the more current is needed, and the greater the power loss in the fixed - resistance transmission lines. of course, lower - resistance lines can ... | openstax_college_physics_2e-web_7zesafu | [
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20. 5 • alternating current versus direct current 879 transmission lines at all. but, as we shall see in a later chapter, there is a limit to current in superconductors, too. in short, high voltages are more economical for transmitting power, and ac voltage is much easier to raise and lower, so that ac is used in most ... | openstax_college_physics_2e-web_7zesafu | [
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20. 6 electric hazards and the human body learning objectives by the end of this section, you will be able to : • define thermal hazard, shock hazard, and short circuit. • explain what effects various levels of current have on the human body. there are two known hazards of electricity — thermal and shock. a thermal haz... | openstax_college_physics_2e-web_7zesafu | [
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come into contact with a low resistance. since, thermal power is created so rapidly that the cord melts or burns. ( b ) a schematic of the short circuit. one particularly insidious aspect of a short circuit is that its resistance may actually be decreased due to the increase in temperature. this can happen if the short... | openstax_college_physics_2e-web_7zesafu | [
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20. 6 • electric hazards and the human body 881 figure 20. 19 ( a ) a fuse has a metal strip with a low melting point that, when overheated by an excessive current, permanently breaks the connection of a circuit to a voltage source. ( b ) a circuit breaker is an automatic but restorable electric switch. the one shown h... | openstax_college_physics_2e-web_7zesafu | [
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shocks to stimulate the heart to beat properly. some fatal shocks do not produce burns, but warts can be 882 20 • electric current, resistance, and ohm's law access for free at openstax. org safely burned off with electric current ( though freezing using liquid nitrogen is now more common ). of course, there are consis... | openstax_college_physics_2e-web_7zesafu | [
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to be further discussed in the next chapter ), electric currents preferentially flow through paths in the human body that have a minimum resistance in a direct path to earth. the earth is a natural electron sink. wearing insulating shoes, a requirement in many professions, prohibits a pathway for electrons by providing... | openstax_college_physics_2e-web_7zesafu | [
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20. 6 • electric hazards and the human body 883 very small currents pass harmlessly and unfelt through the body. this happens to you regularly without your knowledge. the threshold of sensation is only 1 ma and, although unpleasant, shocks are apparently harmless for currents less than 5 ma. a great number of safety ru... | openstax_college_physics_2e-web_7zesafu | [
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shock can cause burns, depending on the concentration of current — the more concentrated, the greater the likelihood of burns. very large currents cause the heart and diaphragm to contract for the duration of the shock. both the heart and breathing stop. interestingly, both often return to normal following the shock. t... | openstax_college_physics_2e-web_7zesafu | [
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. in this condition, currents about 1 / 1000 those listed in table 20. 3 produce similar effects. during open - heart surgery, currents as small as can be used to still the heart. stringent electrical safety requirements in hospitals, particularly in surgery and intensive care, are related to the doubly disadvantaged m... | openstax_college_physics_2e-web_7zesafu | [
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can be burned off with very high frequency current without causing the heart to stop. ( do not try this at home with 60 - hz ac! ) some of the spectacular demonstrations of electricity, in which high - voltage arcs are passed through the air and over people ’ s bodies, employ high frequencies and low currents. ( see fi... | openstax_college_physics_2e-web_7zesafu | [
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20. 7 nerve conduction – electrocardiograms learning objectives by the end of this section, you will be able to : • explain the process by which electric signals are transmitted along a neuron. • explain the effects myelin sheaths have on signal propagation. • explain what the features of an ecg signal indicate. nerve ... | openstax_college_physics_2e-web_7zesafu | [
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20. 7 • nerve conduction – electrocardiograms 885 transmit and process signals within the central nervous system. the sheer number of nerve cells and the incredibly greater number of connections between them makes this system the subtle wonder that it is. nerve conduction is a general term for electrical signals carrie... | openstax_college_physics_2e-web_7zesafu | [
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molecular transport phenomena : diffusion, osmosis, and related processes, free ions will diffuse from a region of high concentration to one of low concentration. but the cell membrane is semipermeable, meaning that some ions may cross it while others cannot. in its resting state, the cell membrane is permeable to and,... | openstax_college_physics_2e-web_7zesafu | [
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maintains the concentration differences, but the cell may fire hundreds of times in rapid succession without seriously depleting them. the separation of charge creates a potential difference of 70 to 90 mv across the cell membrane. while this is a small voltage, the resulting electric field ( ) across the only 8 - nm -... | openstax_college_physics_2e-web_7zesafu | [
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20. 7 • nerve conduction – electrocardiograms 887 called the action potential. ( see figure 20. 26. ) only small fractions of the ions move, so that the cell can fire many hundreds of times without depleting the excess concentrations of and. eventually, the cell must replenish these ions to maintain the concentration d... | openstax_college_physics_2e-web_7zesafu | [
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an enlarged view of an axon having myelin sheaths characteristically separated by unmyelinated gaps ( called nodes of ranvier ). this arrangement gives the axon a number of interesting properties. since myelin is an insulator, it prevents signals from jumping between adjacent nerves ( cross talk ). additionally, the my... | openstax_college_physics_2e-web_7zesafu | [
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20. 7 • nerve conduction – electrocardiograms 889 of the normal operation of these axons, another variable in the nervous system. the degeneration or destruction of the myelin sheaths that surround the nerve fibers impairs signal transmission and can lead to numerous neurological effects. one of the most prominent of t... | openstax_college_physics_2e-web_7zesafu | [
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