Meters and troubleshootingQuestion 1173 of 1506

How can a DC meter movement of the D'Arsonval type read AC?

With a larger shunt resistor across the movement
With a second magnet fitted behind the coil
With an extra winding in series
With a diode bridge that rectifies the AC

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Correct answer: With a diode bridge that rectifies the AC

Four diodes in a bridge steer the current through the movement in one direction all the time.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 12.1: AC Voltmeters and Ammeters

Questions last reviewed: 18 October 2026

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