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(c) protect people against the danger of electric shock. (d) reduce the current in a power supply. (e) smooth out the ac ripple in a power supply. 40. A dc electromagnet (a) has constant polarity. (b) requires an air core. (c) does not attract or repel a permanent magnet. (d) has polarity that periodically reverses. (e) cannot be used to permanently magnetize anything. 41. The rate at which charge carriers flow is measured in (a) amperes. (b) coulombs. (c) volts. (d) watts. (e) watt-hours. 42. Suppose a 12-V battery is connected to a set of three resistors in series. The resistance values are 1.0 , 2.0 , and 3.0 . What is the voltage across the 3.0- resistor (a) 1.0 V (b) 2.0 V (c) 4.0 V (d) 6.0 V (e) 12 V 43. Suppose nine 90- resistors are connected in a 3 3 series-parallel network. What is the total (net) resistance of the network (a) 10 (b) 30 (c) 90 (d) 270 (e) 810 44. A device commonly used for remote switching of high-current circuits is (a) a solenoid. (b) an electromagnet. (c) a potentiometer. (d) a photovoltaic cell. (e) a relay. 45. Memory in a nickel-based cell or battery (a) occurs whenever the battery is discharged. (b) indicates that the cell or battery is dead.
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(c) can usually be remedied by repeated discharging and recharging. (d) can cause an explosion. (e) causes a reversal in polarity. 46. Suppose a 100-W bulb burns for 100 hours. It has consumed how many units of energy (a) 0.10 kWh (b) 1.00 kWh (c) 10.0 kWh (d) 100 kWh (e) 1000 kWh 47. A material with high permeability (a) increases magnetic field quantity. (b) is necessary if a coil is to produce a magnetic field. (c) always has high retentivity. (d) concentrates magnetic lines of flux. (e) reduces flux density. 48. A chemical compound (a) consists of two or more atoms. (b) contains an unusual number of neutrons. (c) is technically the same as an ion. (d) has a shortage of electrons. (e) has an excess of electrons. 49. Suppose a 6.00-V battery is connected to a parallel combination of two resistors whose values are 8.00 and 12.0 . What is the power dissipated in the 8- resistor (a) 0.300 W (b) 0.750 W (c) 1.25 W (d) 1.80 W (e) 4.50 W 50. The main problem with bar-graph meters is the fact that (a) they are not very sensitive. (b) they are unstable. (c) they cannot give very precise readings. (d) you need special training to read them. (e) they can display only peak values.
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CHAPTER
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DIRECT CURRENT CAN BE EXPRESSED IN TERMS OF TWO VARIABLES: DIRECTION (POLARITY) AND
intensity (amplitude). Alternating current (ac) is a little more complicated. This chapter will acquaint you with some common forms of ac.
Definition of Alternating Current
You have learned that dc has polarity that stays constant over time. Although the amplitude (the number of amperes, volts, or watts) can fluctuate from moment to moment, the charge carriers always flow in the same direction at any point in the circuit. In ac, the polarity reverses at regular intervals. The instantaneous amplitude (that is, the amplitude at any given instant in time) of ac usually varies because of the repeated reversal of polarity. But there are certain cases where the amplitude remains constant, even though the polarity keeps reversing. The rate of change of polarity is the variable that makes ac so much different from dc. The behavior of an ac wave depends largely on this rate: the frequency.
Period and Frequency
In a periodic ac wave, the kind that is discussed in this chapter (and throughout the rest of this book), the function of instantaneous amplitude versus time repeats itself over and over, so that the same pattern recurs indefinitely. The length of time between one repetition of the pattern, or one cycle, and the next is called the period of the wave. This is illustrated in Fig. 9-1 for a simple ac wave. The period of a wave can, in theory, be anywhere from a minuscule fraction of a second to many centuries. Period, when measured in seconds, is denoted by T. Originally, ac frequency was specified in cycles per second (cps). High frequencies were sometimes given in kilocycles, megacycles, or gigacycles, representing thousands, millions, or billions (thousand-millions) of cycles per second. But nowadays, the unit is known as the hertz (Hz). Thus, 1 Hz = 1 cps, 10 Hz = 10 cps, and so on. Higher frequencies are given in kilohertz (kHz), megahertz (MHz), or gigahertz (GHz). The relationships are as follows:
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