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.
Which of the following is not a purpose of a resistor in an electrical circuit?
control the voltage in the circuit |
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moderate the heat in the circuit |
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limit the current in the circuit |
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multiply the current in the circuit |