Chapter 23 Electric Current
A
A closed circuit is a circuit in which charge A. can flow. B. is prevented from flowing.
A
A wire carrying a current is normally charged A. not at all. B. positively. C. negatively.
D
A woman experiences an electric shock. The electrons making the shock come from A. the ground. B. the electric field in the air. C. a nearby power supply. D. the object causing the shock.
B
An ampere is a A. unit of resistance. B. unit of current. C. type of charge. D. voltage. E. current.
A
As more lamps are put into a parallel circuit, the overall current in the circuit A. increases. B. stays the same. C. decreases.
C
As more lamps are put into a series circuit, the overall current in the circuit A. stays the same. B. increases. C. decreases.
C
Compared to the filament thickness on a 60-W light bulb, the filament thickness of a 100-W light bulb will be A. less. B. the same. C. greater.
A
Compared to the resistance of two resistors connected in series, the same two resistors connected in parallel have A. less resistance. B. more resistance. C. the same resistance.
A
Compared to thin wires, electrical resistance in thick wires is A. less. B. the same. C. greater.
B
Current from a battery is always A. AC. B. DC.
A
Electric power is defined as A. current times voltage. B. curent divided by voltage. C. current times resistance.
A
Electrical devices in our homes are connected in A. parllel. B. series.
B
Electrical potention energy is the energy a charged object has because of its A. momentum. B. location. C. mass. D. motion.
B
For most conductors as their temperature increases, their resistance A. decreases. B. increases. C. stays the same.
B
How much of each cycle of an alternating current will pass through a diode? A. 1/4. B. 1/2. C. 3/4.
B
If you walk into a region of space and suddenly feel a force, the space is said to contain a A. charged object. B. force field. C. black hole.
B
Power outlets in our homes typically have a potential difference of A. 30 V. B. 120 V. C. 60 A.
D
The frequency of AC current in North America is A. 120 V. B. 50 Hertz. C. 30 V. D. 60 Hertz.
A
The net speed of electrons in a wire is about A. 0.01 cm/s. B. 10 m/s. C. 100 Kilometers per hour.
C
The resistance of your dry skin is usually around A. 0.001 ohms. B. 1 ohm. C. 100,000 ohms.
B
Two electric devices are connected in series. The total resistance to current in the circuit is A. zero. B. the sum of the individual resistance along the circular path. D. the product of the individual resistances along the circuit path.
C
Two lamps, one with a thick filament and one with a thin filament, are connected in parallel to a battery. The voltage is greater across the lamp with the A. thin filament. B. thick filament. C. both voltages are the same.
A
Two lamps, one with a thick filament and one with a thin filament, are connected in parellel 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.
...
Two lamps, one with a thick filament and one with a thin filament, are connected in series to a battery. The voltage is greater across the lamp with the A. thin filament. B. thick filament. C. voltage is the same for both.
C
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. thin filament. B. thick filament. C. current is the same in each lamp.
B
When input to a diode is AC, the output is a(an) A. smooth DC. B. reduced AC. C. amplified AC.
C
When one light bulb in a parallel circuit containing several light bulbs burns out, the other light bulbs A. do not burn at all. B. burn brighter. C. burn the same as before.
C
When one light bulb in a series circuit containing several light bulbs burns out A. none of the other bulbs will light up. B. nothing changes in the rest of the circuit. C. the other light bulbs burn brighter.
A
When resistors are put in parallel with each other their overall resistance is A. smaller than the resistance of any of the resistors. B. larger than the resistance of any other resistor. C. the same as the resistance of one of the resistors.
B
When resistors are put in series next to each other, their overall resistance is A. the same as the resistance of one of the resistors. B. larger than the resistance of any indiviual resistor. C. smaller than the resistance of any of the resistors.
B
Which of the following is a device used to either cut off or allow electrons to flow in a circuit? A. battery. B. switch. C. resister. D. connecting wires.
E
While you are standing on the ground in your running shoes, the greatest resistance between you and the ground is in A. your muscles. B. your legs. C. the clothes you are wearing. D. your skin. E. your running shoes.
