The AC voltage across a resistance can be measured using a

Step-by-step solution

A hot wire voltmeter operates on the principle of the heating effect of electric current, where the heat produced is proportional to the square of the current, H = I^2Rt . Since the heating effect is independent of the direction of the current, it can measure both alternating current (AC) and direct current (DC). Moving coil galvanometers, potential coil galvanometers, and moving magnet galvanometers rely on magnetic effects, which average to zero over a complete cycle for alternating currents, making them unsuitab