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Alternating current cannot be measured by $DC$ ammeter because

$\begin {array} {1 1} (A)\;AC\: cannot\: pass\: through\: DC & \quad (B)\;AC \: changes \: direction \\ (C)\;Average\: value\: of \:current\: for\: a \: complete\: cycle\: is\: zero & \quad (D)\;DC\: ammeter\: will \: get\: damaged \end {array}$

Can you answer this question?

The answer is self-explanatory.
Ans : (C)
answered Feb 16, 2014
edited Mar 14, 2014