| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.35 |
| Score | 0% | 67% |
This circuit component symbol represents a(n):
inductor |
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potentiometer |
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resistor |
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capacitor |
Resistors are used to limit voltage and/or current in a circuit and can have a fixed or variable resistance. Variable resistors (often called potentiometers or rheostats) are used when dynamic control over the voltage/current in a circuit is needed, for example, in a light dimmer or volume control.
What is the voltage of most household electrical systems in the United States?
110V |
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60Hz |
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220V |
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60V |
Most households use electricity with a voltage of 110V.
You would measure the amount of voltage between two points in a circuit with a(n):
reostat |
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battery |
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ammeter |
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voltmeter |
Voltage (V) is the electrical potential difference between two points. A voltmeter is used to measure the voltage between two points in a circuit.
Longer the electrical wires mean _______________ voltage drop.
complete |
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lesser |
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greater |
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diminishing |
Electrical wires have a certain amount of resistance per foot. A longer wire means more resistance and a greater voltage drop.
In electrical wiring, which of the following are proportional?
the length of the wire and the amount of the voltage |
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the length of the wire and the amount of the current |
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the diameter of the wire and the amount of the current |
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the diameter of the wire and the amount of the voltage |
Current flow through a wire increases the temperature of the wire. If too small a wire is used, the wire will heat up causing a loss in conductivity and possibly a fire. The thicker in diameter a wire is, the more current it can carry without overheating.