West Virginia Barber Written Practice Exam 2025 – Complete Study Resource

Question: 1 / 400

What is the variable resistor for controlling a circuit?

Circuit break

GFI (Ground Fault Interrupters)

Rheostat

A variable resistor is a type of resistor that allows for the adjustment of resistance in a circuit. In this case, the variable resistor used for controlling a circuit is known as a rheostat. A rheostat is a two-terminal variable resistor that is commonly used to control the current in a circuit by varying the resistance.

Option A, Circuit break, is not a variable resistor. It is a device designed to interrupt the flow of current in a circuit to protect against overcurrent and short circuits.

Option B, GFI (Ground Fault Interrupters), is a safety device that protects against electric shock by interrupting power when a ground fault is detected. It is not a variable resistor used for controlling a circuit.

Option D, Watt, is a unit of power measurement and not a type of variable resistor.

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Watt

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