Question

Why rheostat is used in Ohm's law?

Answer 1

Answer:

According to Ohm's law, the voltage across and current through a resistor are proportional. If one places a variable resistance (rheostat) across a voltage source, the voltage across the rheostat is fixed. ... Thus, as the resistance of the rheostat increases, the current through the bulb decreases.

Explanation:

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Answer 2

Explanation:

A rheostat is a device which is used to change resistance in a circuit (a variable resistance). In the Ohm's law experiment we use a rheostat to change the resistance and so we obtain different current values keeping the voltage constant.