First slide

Alternating current and voltage

Question

Alternating current can not be measured by DC ammeter because

Moderate

A

AC cannot pass through DC ammeter
B

Average value of complete cycle is zero
C

AC is virtual
D

AC changes its direction

Solution

In DC ammeter, a coil is free to rotate in the magnetic field of a fixed magnet.
If an alternating current is passed through such a coil, the torque will reverse its direction each time the current changes direction and the average value of the torque will be zero.

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