| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.39 |
| Score | 0% | 68% |
Longer the electrical wires mean _______________ voltage drop.
complete |
|
diminishing |
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lesser |
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greater |
Electrical wires have a certain amount of resistance per foot. A longer wire means more resistance and a greater voltage drop.
What is the voltage of most household electrical systems in the United States?
60Hz |
|
110V |
|
220V |
|
60V |
Most households use electricity with a voltage of 110V.
Which of the following is a difference between a circuit breaker and a fuse?
a circuit breaker can be reused |
|
a fuse responds more quickly than a circuit breaker |
|
all of these |
|
a fuse is cheaper than a circuit breaker |
Like fuses, circuit breakers stop current flow once it reaches a certain amount. They have the advantage of being reusable (fuses must be replaced when "blown") but respond more slowly to current surges and are more expensive than fuses.
The formula specifying Ohm's law is which of the following?
\(V = {R \over I}\) |
|
V = I2R |
|
V = IR |
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\(V = {I \over R}\) |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
In household electrical wiring, which color of insulation indicates the 'hot' wire?
green |
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black |
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red |
|
white |
In the NM cable used for wiring homes, each cable has three wires inside a sheath with each wire covered in a different color of insulation to indicate its type. The wire with the black insulation is the 'hot' wire, white is the neutral wire, and the ground wire is either covered in green insulation or left bare.