Download Name True/False Indicate whether the statement is true or false

Name _______________________________________
True/False
Indicate whether the statement is true or false.
____
1. A substance that slows the movement of electrons is called a conductor.
____ 2. A fuse or circuit breaker places a restriction on the amount of current that can flow in a home.
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
3. A light bulb transforms electrical energy into:
____
4. A generator transforms:
____
____
5. The output energy of a generator:
6. The ohm is a unit of electrical:
____
7. The volt is a unit of electrical:
____
8. The ampere, or amp, is a unit of electrical:
____
9. The watt is a unit of electrical:
____ 10. The equation P = IV is used to calculate electrical:
____ 11. Both a joule and a watt-second are units of:
____ 12. One ampere, or amp, equals:
____ 13. One volt equals:
____ 14. One watt equals:
____ 15. What is the maximum current for a 120-volt circuit rated at 2,400 watts?
____ 16. If the current flow in a 120-volt vacuum cleaner is 5 amps, what is the power of the vacuum cleaner?
____ 17. In a simple electric circuit, a 110-volt electric heater draws 2.0 amperes of current. What is the resistance of
the electric heater?
____ 18. Which circuit diagram below correctly shows the connection of ammeter A and voltmeter V to measure the
current through and potential difference across resistor R?
____ 19. Identical resistors R are connected across the same 12-volt battery. Which circuit uses the greatest power?
____ 20. A charge of 5.0 coulombs moves through a circuit in 0.50 second. What is the current in the circuit?
____ 21. An operating electric iron draws a current of 5 amperes and has a resistance of 20 ohms. How much energy
does the iron use when operating for 40 seconds?
____ 22. In the circuit below, what are the correct readings of the voltmeters V and V ?
____ 23. What is the total electrical energy used by a 1,500-watt hair dryer operating for 6.0 minutes?
____ 24. In the diagram below, lamps L and L are connected to a constant voltage power supply. If lamp L burns
out:
____ 25. An operating electric heater draws a current of 10. amperes and has a resistance of 12 ohms. How much
energy does the heater use in 60. seconds?
____ 26. How much current flows through a 12-ohm flashlight bulb operating at 3.0 volts?
____ 27. Which device controls the flow of electrons in an electric circuit?
____ 28. As the amount of current produced by a hand-operated generator increases:
____ 29. A resistor is placed in a circuit. The current in the circuit is 2 amperes and the voltage drop across the resistor
is 8 volts. The voltage is then increased to 12 volts. What will be the new current?
____ 30. Your hairdryer has a resistance of 9.6 ohms and you plug it into the bathroom outlet. The household voltage is
120 volts. If your sister plugs in an identical hairdryer into the same circuit, how much current will the two
hairdryers draw?
____ 31. A resistor of 6 ohms is placed in a circuit. The voltage drop across the resistor is 12 volts. What is the current
through the resistor?
____ 32. The current in a circuit is 3 amperes and the voltage drop across the resistor is 12 volts. What is the value of
the resistor in the circuit?
____ 33. Three wires were tested in a laboratory setting. The current was measured as the voltage across the wire was
varied. The results of the experiment appear in the graph below. All three wires obey Ohm’s Law. Which wire
has the greatest resistance?
____ 34. How much current must be flowing through a 60.-watt light bulb when it is operating in a 120-volt household
circuit?
____ 35. A 12-volt car battery supplies 48 amperes of current to the car’s starter. What is the power output of the car
battery?
____ 36. A light bulb has a resistance of 240 ohms. If the bulb is connected to a 120-volt source, what is the power
output of the light bulb?
____ 37. A 120-volt circuit for a kitchen of a home is protected by a 20-ampere circuit breaker. What combination of
the following appliances would most likely cause the circuit breaker to trip?
Appliance
toaster
frying pan
blender
coffeemaker
Power demand (watts)
1,000
1,200
300
600
____ 38. How many 60.-watt incandescent light bulbs can be operated at the same time on a 120-volt, 15-ampere
circuit in a home?
____ 39. A 3.0-watt wall clock operates at 120 volts. How much current does the clock draw?
____ 40. Which current reading would be on the ammeter in the circuit represented in the diagram below?
____ 41. A 12-volt car battery supplies 45 amperes of current to the starter of the car. If the starter draws energy for 14
seconds, how much energy does the starter use?
____ 42. A student uses a 1,500-watt hair dryer for 5.0 minutes every morning to dry his hair. How much electrical
energy is the student changing to heat?
Short Answer
43. Which kind of electric circuit would you choose for household wiring, parallel or series? Please explain your
answer.