Hot Wire Voltmeter

The construction of a hot-wire voltmeter is almost identical to a hot-wire ammeter except that a high resistance r is connected in series with the wire AB in places of the shunt r. The alternating voltage to be measured is applied across T₁ and T₂. A current passes through AB and the pointer attached to the cylinder deflects. The deflection is proportional to V2rms. The scale is graduated is such a way that it reads directly the rms voltage.


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