An AC ammeter is used to measure current in a circuit. When… | CGP Edu

Physics Alternating Current AC Circuits MCQ (Single Correct)

An AC ammeter is used to measure current in a circuit. When a given direct current passes through the circuit, the AC ammeter reads 3 ampere. When another alternating current passes through the circuit, the AC ammeter reads 4 ampere. Then the reading of this ammeter if DC and AC flow through the circuit simultaneously, is -

A

3 amper

B

1 ampere

C

7 ampere

D

5 ampere

Text Solution

Verified by Experts

The correct answer is:

Quantity of heat liberated in the ammeter of resistance
(i) Due to direct current of 3 ampere
(ii) Due to alternating current of 4 ampere

Total heat produced per second

Let the equivalent alternating current be I ampere; then

or

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