Describe how a thermocouple ammeter is used to measure an alternating current

Describe how a thermocouple ammeter is used to measure an alternating current

P and Q are dissimilar wires

Current to be measured is passed through the wire AB and heats the junction R of the thermocouple. The thermoelectric effect generated at R causes a direct current to flow through the micrometer calibrated to measure the r.m.s value of current.

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