Q. Alternating current cannot be measured by DC ammeter because
A) AC cannot pass through DC ammeter
B) AC changes direction
C) Average value of current for complete cycle is zero
D) DC ammeter will get damaged
Explanation
(c) The full cycle of alternating current consists of two half cycles. For one – half, current is positive and for second half, current is negative. Therefore, for an AC cycle, the net value of current average out to zero. While the DC ammeter, read the average value. Hence, the alternating current cannot DC measured by DC ammeter.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.