Alternating current can not be measured by dc ammeter because - Vidyadip

MCQ

Alternating current can not be measured by dc ammeter because

A
$ac$ cannot pass through dc ammeter
✓
Average value of complete cycle is zero
C
$D.C.$ ammeter will get damaged.
D
$ac$ changes its direction

✓

Answer

Correct option: B.

Average value of complete cycle is zero

b
(b)In $d$c 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 it’s direction each time the current changes direction and the average value of the torque will be zero.

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