Hot wire ammeters measure the _______ value of AC.

average

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rms

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peak

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None of these

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Solution

The correct option is B rms
Hot wire ammeter is based on the principle of heating of wire.

The rms value of the AC is equal to the value of DC which produce same heating in the wire in same time interval.

Therefore, hot wire ammeters measures rms value of AC.

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I = I_{1} sin ω t + I_{2} cos ω t

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