Hot wire ammeters are used for measuring -

Only AC

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Only DC

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Both AC and DC

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None of these

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Solution

The correct option is C Both AC and DC
The hot wire ammeter is a device used to measure AC or DC current intensity based on the thermal expansion of a wire that is heated due to the flow of the electric current through it, as the heat produced is proportional to the square of DC or rms value of AC.

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