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Domestic electric circuits and safety precautions - class-X

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Alternating current can not be measured by $D.C$. ammeter because 

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A
average value of current for complete cycle is zero
💡 Explanation:

While for half-circle, the value of current is different at different points and for complete cycle its average value is zero.

So, we can't measure current by $D.C$ ammeter .

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