Which switch type uses variable resistance to control current?

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Multiple Choice

Which switch type uses variable resistance to control current?

Explanation:
The idea being tested is how to control current with resistance. A rheostat provides variable resistance, allowing you to change the current by adjusting the resistance in the circuit. As you turn the control, the resistance changes, which, by Ohm’s law (I = V/R), directly changes the current through the load. This makes rheostats ideal for applications requiring gradual, continuous adjustment (like dimming lights or tuning a motor). The other options are binary switches that simply open or close a circuit; they don’t offer a continuous, adjustable resistance.

The idea being tested is how to control current with resistance. A rheostat provides variable resistance, allowing you to change the current by adjusting the resistance in the circuit. As you turn the control, the resistance changes, which, by Ohm’s law (I = V/R), directly changes the current through the load. This makes rheostats ideal for applications requiring gradual, continuous adjustment (like dimming lights or tuning a motor). The other options are binary switches that simply open or close a circuit; they don’t offer a continuous, adjustable resistance.

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