Question

The AC voltage across a resistance can be measured using
(a) a potentiometer
(b) a hot-wire voltmeter
(c) a moving-coil galvanometer
(d) a moving-magnet galvanometer

Answer 1

Answer:

(B) A hot-wire voltmeter measured using AC voltage across a resistance

Answer 2

The AC voltage across a resistance can be measured using a hot-wire voltmeter.

(b) is correct option

Explanation:

DC voltmeter cannot measure the AC voltage.

When we used in ac circuit then these instruments does not record the reading because average value of alternating voltage over a full cycle is zero.

So, these instrument record zero reading.

AC voltage across the resistance can be measured by using ac voltmeter.

AC voltmeter is known as a hot wire voltmeter.

Hence, The AC voltage across a resistance can be measured using a hot-wire voltmeter.