Section 1
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14) The source of electrons in an ordinary electrical circuit is A) a dry cell, wet cell or battery. B) the back emf of motors. C) the power station generator. D) the electrical conductor itself. E) none of these.
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Cards (63)
Section 1
(50 cards)
14) The source of electrons in an ordinary electrical circuit is A) a dry cell, wet cell or battery. B) the back emf of motors. C) the power station generator. D) the electrical conductor itself. E) none of these.
d
1) Electrons are made to flow in a wire when there is A) an imbalance of charges in the wire. B) more potential energy at one end of the wire than the other. C) a potential difference across its ends.
1) Answer: C
34) A capacitor is used to store A) charge. B) energy. C) both. D) neither.
34) Answer: C
16) A woman experiences an electrical shock. The electrons making the shock come from the A) woman's body. B) ground. C) power plant. D) hairdryer. E) electric field in the air.
a
27) In an electric circuit, the safety fuse is connected to the circuit in A) series. B) parallel.
a
36) Two lamps, one with a thick filament and one with a thin filament, are connected in series. The current is greater in the lamp with the A) thick filament. B) thin filament. C) the same in each lamp.
36) Answer: C
9) A wire carrying a current is normally charged A) negatively. B) positively. C) not at all.
c
37) Two lamps, one with a thick filament and one with a thin filament, are connected in parallel to a battery. The voltage is greatest across the lamp with the A) thick filament. B) thin filament. C) both voltages are the same.
37) Answer: C
44) Compared to the resistance of two resistors connected in series, the same two resistors connected in parallel have A) more resistance. B) less resistance. C) the same resistance.
44) Answer: B
50) The power dissipated in a 4-ohm resistor carrying 3 A is A) 7 W. B) 18 W. C) 36 W. D) 48 W. E) not enough information to say.
50) Answer: C
24) Modern automobile headlights are connected in A) parallel. B) perpendicular. C) series. D) none of these.
a
13) When a 10-V battery is connected to a resistor, the current in the resistor is 2 A. What is the resistor's value? A) 2 ohms B) 5 ohms C) 10 ohms D) 20 ohms E) more than 20 ohms
b
25) There are electrons in the filament of the ac lamp in your bedroom. When you turn on the lamp and it glows, the glowing comes from A) different electrons; the ones that flow in the circuit to your lamp. B) the same electrons. C) the positive charges that flow in the filament.
b
18) When a light switch is turned on in a dc circuit, the average speed of electrons in the lamp is A) the speed of sound waves in metal. B) the speed of light. C) 1000 cm/s. D) less than 1 cm/s. E) dependent on how quickly each electron bumps into the next electron.
d
40) As more lamps are put into a series circuit, the overall current in the power source A) increases. B) decreases. C) stays the same.
40) Answer: B
31) An electrical diode is useful for A) storing electrical energy. B) boosting voltage. C) limiting current. D) voltage modification. E) changing ac to dc.
31) Answer: E
12) A 10-ohm resistor has a 5-A current in it. What is the voltage across the resistor? A) 5 V B) 10 V C) 15 V D) 20 V E) more than 20 V
e
43) When we say an appliance "uses up electricity," we really are saying that A) current disappears. B) electric charges are dissipated. C) the main power supply voltage is lowered. D) electrons are taken out of the circuit and put somewhere else. E) electron kinetic energy is changed into heat.
43) Answer: E
39) Two lamps, one with a thick filament and one with a thin filament of the same material, are connected in series to a battery. The voltage is greater across the lamp with the A) thick filament. B) thin filament. C) voltage is the same for both.
39) Answer: B
8) Stretch a copper wire so that it is thinner and the resistance between its ends A) decreases. B) remains unchanged. C) increases.
c
10) In an ac circuit, the electric field A) increases via the inverse square law. B) changes magnitude and direction with time. C) is everywhere the same. D) is non-existent. E) none of these.
b
41) As more lamps are put into a parallel circuit, the overall current in the power source A) increases. B) decreases. C) stays the same.
41) Answer: A
4) A coulomb of charge that passes through a 6-volt battery is given A) 6 joules. B) 6 amperes. C) 6 ohms. D) 6 watts. E) 6 newtons.
a
19) Alternating current is normally produced by a A) battery. B) generator. C) both of these. D) neither of these. 19) Alternating current is normally produced by a A) battery. B) generator. C) both of these. D) neither of these.
b
17) In a common dc circuit, electrons move at speeds of A) a fraction of a centimeter per second. B) many centimeters per second. C) the speed of a sound wave. D) the speed of light. E) none of these.
a
46) A 60-watt light bulb is connected to a 120-volt plug. What is the current in the light bulb? A) 0.25 A B) 0.5 A C) 2 A D) 4 A E) more than 4 A
46) Answer: B
11) The current through a 10-ohm resistor connected to a 120-V power supply is A) 1 A. B) 10 A. C) 12 A. D) 120 A. E) none of these.
c
38) Two lamps, one with a thick filament and one with a thin filament of the same material, are connected in parallel to a battery. The current is larger in the lamp with the A) thick filament. B) thin filament. C) current is the same in both.
38) Answer: A
21) When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is A) more than the resistance of either lamp. B) less than the resistance of either lamp. C) none of these.
b
22) When two lamps are connected in series to a battery, the electrical resistance that the battery senses is A) more than the resistance of either lamp. B) less than the resistance of either lamp. C) none of these.
a
3) A wire that carries an electric current A) is electrically charged. B) may be electrically charged. C) is never electrically charged.
b
32) In the 110-volt circuit shown, A) 110 coulombs of charge flow through the lamp every second. B) 110 joules of energy are converted to heat and light in the circuit every second. C) 110 joules of energy are given up by each coulomb of charge making up the current in the circuit. D) 110 joules of energy are shared among all the coulombs in the circuit at any instant. E) none of the above.
32) Answer: C
45) If you plug an electric toaster rated at 110 V into a 220-V outlet, the current in the toaster will be about A) half what it should be. B) the same as if it were plugged into 110 V. C) more than twice what it should be. D) twice what it should be.
45) Answer: D
2) An ampere is a unit of electrical A) pressure. B) current. C) resistance. D) all of these. E) none of these.
b
42) A circuit is powered with a battery. Charge flows A) out of the battery and into the circuit. B) from the negative battery terminal to the positive terminal. C) after a couple seconds passes. D) through both the battery and the rest of the circuit. E) none of these.
42) Answer: D
6) Electrons move in an electrical circuit A) by being bumped by other electrons. B) by colliding with molecules. C) by interacting with an established electric field. D) because the wires are so thin. E) none of these.
c
26) A 100-Watt lamp glows brighter than a 25-Watt lamp. The electrical resistance of the 100-Watt lamp must be A) less. B) greater. C) the same.
a
7) Heat a copper wire and its electric resistance A) decreases. B) remains unchanged. C) increases.
c
20) The electric power of a lamp that carries 2 A at 120 V is A) 1/6 watts. B) 2 watts. C) 60 watts. D) 20 watts. E) 240 watts. 20) The electric power of a lamp that carries 2 A at 120 V is A) 1/6 watts. B) 2 watts. C) 60 watts. D) 20 watts. E) 240 watts.
e
48) The headlights, radio, and defroster fan in an automobile are connected in A) series. B) parallel.
48) Answer: B
35) The number of electrons delivered daily to an average American home by an average power utility in the mid 1980s was A) zero. B) 110. C) 220. D) billions of billions. E) none of these.
35) Answer: A
15) The source of electrons lighting an incandescent ac light bulb is A) the power company. B) electrical outlet. C) atoms in the light bulb filament. D) the wire leading to the lamp. E) the source voltage.
c
29) A circuit breaker serves the same purpose as A) a switch. B) a fuse. C) a capacitor. D) a battery. E) none of these.
b
33) In the circuit of Figure 23-A, energy is given to the moving charges by A) the bulb. B) the wires. C) a generator which is not shown. D) none of these.
33) Answer: C
30) A capacitor is useful in A) boosting the energy output of a circuit. B) increasing the current in a resistor. C) smoothing pulsed current. D) switching dc to ac in a circuit. E) increasing or decreasing voltage.
c
23) On some early automobiles both headlights went out when one bulb burned out. The headlights must have been connected in A) parallel. B) perpendicular. C) series. D) haste.
c
47) What is the power rating of a light bulb if 0.8 A flow through it when it is connected to a 120-volt outlet? A) 12 W B) 15 W C) 60 W D) 96 W E) 120 W
47) Answer: D
28) When a pair of 1-ohm resistors are connected in series, their combined resistance is A) 1 ohm, and when connected in parallel, 2 ohms. B) 2 ohms, and when in parallel, 1 ohm. C) 1/2 ohm, and when in parallel, 2 ohms. D) 2 ohms, and when in parallel, 1/2 ohm. E) none of these.
d
5) Which statement is correct? A) Charge flows in a circuit. B) Voltage flows through a circuit. C) Resistance is established across a circuit. D) Current causes voltage
a
49) A 4-ohm resistor is connected in parallel with a 6-ohm resistor. This combination produces an equivalent resistance of A) 2.4 ohms. B) 4 ohms. C) 5 ohms. D) 5.5 ohms. E) 10 ohms.
49) Answer: A
Section 2
(13 cards)