Electric Challenge
NOTE: The following questions are provided as a study guide. The questions on the official exam may
or may not be in this set of questions.
1. The Underwriters Laboratory seal:
a. Is a basic electrical code
b. Means the item is the best of that type that you can buy
c. Means the item, when new, is safe to use under the conditions for which it was designed.
d. All of the above
e. None of the above
2. A compass needle points to the north pole because:
a. there is a gravitational field around the earth
b. there is a magnetic field around the earth
c. there is a grid line around the earth
d. all of the above
3. Magnetism and electricity are closely related. Which of the following are true statements:
a. Electrical meters measure magnetic effects in order to detect the flow of electrons.
b. Electric motors produce motion from electricity because magnetic flux forces the rotor to turn.
c. Transformers step up or step down voltage because of the magnetic field strength.
d. All of the above
e. None of the above
4. Electric power is a function of voltage and current. Which of the following best describes the
relationship:
a. Power is current times voltage.
b. Power is current times resistance.
c. Voltage is power divided by current.
d. A and B
e. A and C
f. None of the above
5. This symbol is used to represent a __________.
a. Switch
b. Light
c. 240 volt receptacle
d. 120 volt receptacle
6. What is needed to make electricity flow?
a. batteries and light bulbs
b. wire and device such as a light bulb
c. something to push electrons and a path for the electrons to follow
d. all of the above
7. If a circuit contains two light bulbs wired in series and one of the bulbs is removed from the circuit
the other bulb will:
a. go out
b. burn more brightly
c. burn less brightly
d. remain unchanged
8. Which of the following will make an electromagnet stronger?
a. adding more coils
b. increasing the voltage
c. putting a switch in the circuit
d. both a and b
9. A circuit contains one battery and two light bulbs. The circuit is wired in parallel if:
a.
b.
c.
d.
there is a switch in the circuit
there is a branch in the circuit, such that the electrons can follow more than one path
if you remove one of the light bulbs from the circuit, the other bulb goes out
none of the above
10. If you hang a magnet from a thread, the north pole of the magnet will:
a. turn to point south
b. turn to point north
c. hang where you placed it
11. What type of light bulb has a filament housed in a container, which is filled with a non-oxygen type
gas (argon, nitrogen, or halogen)?
a.
b.
c.
d.
Incandescent Bulbs
Fluorescent Bulbs
Compact Fluorescent Bulbs
None of the above
12. According to Ohm’s law, if the resistance in a circuit is held constant and the voltage is
increased, what will happen to the current in the circuit?
a. The current will increase.
b. The current will decrease
c. The current will not change
13. Magnetism is important for the operation of:
a. Transformers
b. Voltmeters
c. Telephones
d. Loudspeakers
e. All of the above
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14. 1 kilowatt = _____ watts
a. 10
b. 100
c. 1000
d. 10000
15. Ground Fault Interrupters (GFIs) are:
a. a safety device designed to sense current flow on both hot and grounded neutral wires
b. Required by electrical code on all outlets
c. Can replace a regular circuit breaker.
d. A and B.
e. A and C.
f. All of the above
16. What is a device that controls a light or receptacle from two locations, usually from different ends of
the room?
a. Single pole switch
b. Double pole switch
c. Three way switch
d. Four way switch
17. Electrical wire is rated by gauge. The gauge number increases as:
a. The wire size (diameter) decreases.
b. The wire size (diameter) increases.
c. The wire size (length) decreases.
d. The wire size (length) increases.
18. In an electrical circuit, a diode acts like:
a. a 'switch'
b. a 'rectifier' or
c. an 'amplifier'?
19. The measure of electrical pressure is:
a. Watts
b. Volts
c. Ohms
d. Amps
e. None of the above
20. Who discovered that a magnetic field is generated around a wire carrying an electrical current:
a. Faraday
b. Watt
c. Oersted
d. Collins
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21. When electricity takes a path that the designer of the circuit did not intend for it to take, we say the
circuit has a:
a.
b.
c.
d.
closed connection
opened connection
a short
none of the above
22. Appliance cords are rated by letters to indicate where they are safe to use. Cords rated SJ, SV, SJT or
SJO are:
a. Light duty household use
b. Heater cord
c. Heavy-duty- cord
d. All of the above
e. None of the above
23. A galvanometer is a device used to sense:
a. voltage
b. resistance
c. current
d. all of the above
24. Which of the following is a good conductor:
a.
b.
c.
d.
air
copper
gold
b and c
25. An analogy that is often used to describe electricity is the garden hose, Consider a garden hose
attached to a house spicket. Match the following by putting the appropriate letter in the blank:
B
rate of water flow
a. voltage
A
water pressure
b. current
C
spicket setting (how open the valve is)
c. resistance
26. How much will it cost to operate a 60 W light bulb for 1000 hours if electricity costs $0.08/kwh?
a. $5.50
b. $4.80
c. $48.00
d. $0.48
27. The two types of glare are:
a. direct, hazed
b. hazed, reflected
c. direct, reflected
d. bouncing, absorbed
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28. Which of the following bulb produces the most light given the same wattage.
a. Incandescent
b. Fluorescent
c. Halogen
29. What type of wire has a thermoplastic cover, is heat and moisture resistant, and can be used in wet
and dry locations?
a. Type T
b. Type TW
c. Type THW
d. Type THHN
30. The color of the grounded wire covering can be __________.
a.
b.
c.
d.
red, black, or blue
white or natural gray
green or green/yellow
bare
31. What is a safety device used to protect electrical circuits from being overloaded and heating up
causing a fire?
a. Insulation on the wire
b. the main service panel
c. a Circuit Breaker
d. a Circuit Tester
32. The scientist who discovered how to use magnets to produce electricity was:
a. Georg Ohm
b. Michael Faraday
c. Luigi Galvani
d. Nikola Tesla
33. What is attached to an appliance that lists data on the appliance such as voltage, wattage, and serial
number?
a. Capacity Label
b. Appliance nameplate
c. Appliance Label
d. Electrical nameplate
34. EER stand for
a. Estimated Energy Rating
b. Estimated Energy Ratio
c. Energy Efficiency Ratings
d. Energy Efficiency Ratio
35. For electrical connections, a simple transistor has:
a. two leads,
b. three leads or
c. four leads?
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36. In an electrical circuit, a silicon controlled rectifier can act like:
a. a "switch"
b. a "rectifier"
c. an "amplifier" or
d. both a "switch" and "rectifier"?
37. In an electrical circuit, an amplifier can be used to increase the:
a. amperage of the output circuit,
b. the voltage of the output circuit, or
c. both the amperage and voltage of the output circuit?
38. The resistance of the following circuit is:
R wire 1 = 3
R bulb = 74
R wire 2 = 5
a.
b.
c.
d.
66
74
78
82
39. If a circuit contains two light bulbs wired in parallel and one of the bulbs is removed from the circuit
the other bulb will:
a. go out
b. continue to burn
c. blink on and off
d. none of the above.
40. An open circuit provides a complete path for electrons to flow. True or False
a. true
b. false
c. depends on the type of circuit
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41. For the following circuit, indicate the voltage that you would measure across each of the points
indicated: (series circuit with D-cell two batteries)
1.5
AB ________
IJ _________
1.5
IB _________
3.0
CD ________
3.0
0 ___
EF ______
42. A material that allows electrons to flow:
a.
b.
c.
d.
will have a low electrical resistance and is called an insulator
will have a high electrical resistance and is called a conductor
will have a low electrical resistance and is called a conductor
will have a high electrical resistance and is called an insulator.
43. If a circuit with a switch exhibits continuity, which of the following is (are) true:
a. The resistance in the circuit is some finite value (that is, less than infinity)
b. The switch is open
c. The switch is closed
d. A and b
e. A and c
f. None of the above
44. To increase the strength of an electromagnet you can:
a. increase the voltage to the electromagnet
b. increase the number of wraps of wire around the solenoid core
c. decrease the voltage
d. a and b
e. b and c
f. none of the above
45. A three-way switch allows you to:
a. control one light (or other electrical device) from three locations
b. control one light (or other electrical device) from two locations
c. control three devices with one switch
d. none of the above.
46. What type of wire has a thermoplastic cover, is heat resistant, and used in dry locations?
a. Type T
b. Type TW
c. Type THW
d. Type THHN
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47. The color of the grounding wire covering can be __________.
a. red or black
b. white or natural gray
c. green or green/yellow
d. blue
48. What type of light bulb has a small filament at each end with a small amount of mercury included?
a. Incandescent Bulbs
b. Fluorescent Bulbs
c. Halogen Bulbs
d. None of the above
49. This symbol is used to represent a __________.
a. Switch
b. Light
c. 240 volt receptacle
d. 120 volt receptacle
50. What is a device that controls a light or receptacle from three or more locations, usually from
different locations in a room?
a. Single pole switch
b. Double pole switch
c. Three way switch
d. Four way switch
51. If two D-cell batteries are wired in series, the voltage across all two will be:
a. 1.5 V
b. 3V
c. 6V
d. none of the above
52. Fuses are named according to their shape. These are:
a. Round fuses and tubular fuses
b. Round fuses and cartridge fuses
c. Plug fuses and cartridge fuses
d. Tubular fuses and plug fuses
53. If three D-cell batteries are wired in series, the voltage across all three will be:
e. 1.5 V
f. 3V
g. 6V
h. none of the above
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54. For the following circuit, indicate the voltage that you would measure across each of the points
indicated. The voltage source is a D-cell battery.
AB __1.5_____
EF ___1.5_____
GH __1.5______
55. What is the meter reading?
a.
b.
c.
d.
54321
41230
41231
39230
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