# Physics Chapter 23

63 Questions  I  By Qtkhmerqueen143
Physics Chapter 23

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 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
 2 An ampere is a unit of electrical
 A. Pressure
 B. Current
 C. Resistance
 D. All of these
 E. None of these
 3 A wire that carries an electric current
 A. Is electrically charged
 B. May be electrically charged
 C. Is never electrically charged
 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
 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
 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
 7 Heat a copper wire and its electric resistance
 A. Decreases
 B. Remains uncharged
 C. Increases
 8 Stretch a copper wire so that it is thinner and the resistance between its ends
 A. Decreases
 B. Remains unchanged
 C. Increases
 9 A wire carrying a current is normally charged
 A. Negatively
 B. Positively
 C. Not at all
 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
 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
 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
 13 When a 10-V battery is connected to a resistor, the current in the resistor is 2A. What is the resistor's value?
 A. 2 ohms
 B. 5 ohms
 C. 10 ohms
 D. 20 ohms
 E. More than 20 ohms
 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
 15 The source of electrons lighting an incandescent as 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
 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
 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
 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
 19 Alternating current is normally produced by a
 A. Battery
 B. Generator
 C. Both of these
 D. Neither of these
 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
 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
 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 lap
 C. None of these
 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
 24 Modern automobile headlights are connected in
 A. Parallel
 B. Perpendicular
 C. Series
 D. None of these
 25 There are electrons int he 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
 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
 27 In an electric circuit, the safety fuse is connected to the circuit in
 A. Series
 B. Parallel
 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. Non of these
 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
 30 A capacitor is useful in
 A. Switching dc to ac in a circuit
 B. Increasing or decreasing voltage
 C. Boosting the energy output of a circuit
 D. Increasing the current in a resistor
 E. Smoothing pulsed current
 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
 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
 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. Non of these
 34 A capacitor is used to store
 A. Charge
 B. Energy
 C. Both
 D. Neither
 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. Billion of billions
 E. None of these
 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
 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
 38 Two lamps, one with 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
 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
 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
 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
 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
 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
 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
 45 If you plug an electric toaster rated at 110 V into a 220-V outlet, the current in the toaster wil be about
 A. Half what it should be
 B. The same as if it were plugged in 110 V
 C. More than twice what it should be
 D. Twice what it should be
 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
 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
 48 The headlights, radio, and defroster fan in an automobile are connected in
 A. Series
 B. Parallel
 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
 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
 51 Which is more dangerous, touching a faulty 110-volt light fixture, or a van de graaff generator charged to 100,00 volts?
 A. Touching the light fixture
 B. Touching the generator
 C. Touching both are about equally dangerous
 52 A 60- W light bulb and a 100-W light bulb are each rated at 120 V. which light bulb has a larger resistance?
 A. The 60- W bulb
 B. The 100- W bulb
 C. Both have the same resistance
 53 A 60 W light bulb and a 100- W light bulb are each connected to a 120 V outlet. Which light bulb has more current in it?
 A. The 60- W bulb
 B. The 100- W bulb
 C. Both have the same current
 54 Compared to the filament thickness of a 60-W light bulb, the filament of a 100-W light bulb will be
 A. Thinner
 B. Thicker
 C. The same
 55 Compared to a single lamp connected to a battery, two identical lamps connected in series to the same batter will carry
 A. More current
 B. Less current
 C. The same current
 56 Compared to a single lamp connected to a battery, two lamps connected in parallel to the same battery will carry
 A. More current
 B. Less current
 C. The same current
 57 An electric hater is rated at 300 W when used in a 110-V circuit. The safety fuse n the circuit can handle 15 A of current. how many heaters can be safely operated in the circuit?
 A. 2
 B. 3
 C. 4
 D. 5
 E. More than 5
 58 A heater uses 20 A when used in a 110-V line. If electric power costs 10 cents per kilowatt hour, the cost of running the heater for 10 hours is
 A. \$0.22
 B. \$0.55
 C. \$2.20
 D. \$5.50
 E. None of these
 59 The current through two identical light bulbs connected in series is 0.25 A. the voltage across both bulbs is 110 V. the resistance of a single light bulb is
 A. 22 ohms
 B. 44 ohms
 C. 220 ohms
 D. 440 ohms
 E. None of these
 60 A power line with a resistance of 2 ohms has a current of 80 A in it. the power dissipated in the line is
 A. 40 W
 B. 160 W
 C. 320 W
 D. 12800 W
 E. None of these
 61 What is the resistance of a 120-W incandescent lamp connected to a 120-V power supply?
 A. 1 ohm
 B. 60 ohms
 C. 100 ohms
 D. 144 ohms
 E. None of these
 62 Compared to the amount of electric current in the filament of a lamp, the amount of current in the connecting wire is
 A. Definitely less
 B. Often less
 C. Actually more
 D. The same
 E. Incredibly all of these
 63 Connect a pair of lamps in series and you draw current from the connected battery. connect the same lamps in parallel and you draw
 A. The same current
 B. More current
 C. Less current
 D. Sometimes more, sometimes less
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