Meters and troubleshootingQuestion 1189 of 1506

How can a three-phase wattmeter movement be built from dynamometer movements?

One movement with a single moving coil
Three movements with one coil on each shaft
Two movements with permanent magnets
Two movements on one shaft

Show answer

Correct answer: Two movements on one shaft

Both moving coils turn one pointer, so a single scale shows the three-phase power.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 12.3: Power Measurement

Questions last reviewed: 18 October 2026

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