| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.37 |
| Score | 0% | 67% |
What is the voltage of most household electrical systems in the United States?
220V |
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60V |
|
60Hz |
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110V |
Most households use electricity with a voltage of 110V.
Which of the following converts electrical energy into another form of energy in an electrical circuit?
DC source |
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AC source |
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wiring |
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load |
A load is a source of resistance that converts electrical energy into another form of energy. The components of a microwave, for example, are loads that work together to convert household electricity into radation that can be used to quickly cook food.
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 |
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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.
Which of the following is not a purpose of a resistor in an electrical circuit?
multiply the current in the circuit |
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limit the current in the circuit |
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control the voltage in the circuit |
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moderate the heat in the circuit |
Resistors can be chosen in a wide variety of values to control the voltage in a circuit, limit the current, or moderate the heat produced by the components in the circuit.
Resistance and current are __________ proportional.
not |
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inversely |
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directly |
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exponentially |
Resistance is opposition to the flow of current and is measured in ohms (Ω). One ohm is defined as the amount of resistance that will allow one ampere of current to flow if one volt of voltage is applied. As resistance increases, current decreases as resistance and current are inversely proportional.