Question

A permanent-magnet, moving-coil

meter mechanism can be adapted to
measure alternating current and
voltage if it is used with which of
the following devices?
1. A transformer
2. A transponder
3. A rectifier
4. A reactor

Answer 1

A rectifier is used with a permanent-magnet, moving-coil meter mechanism to measure alternating current and voltage, converting AC to DC for accurate readings.

Step-by-step explanation:

To adapt a permanent-magnet, moving-coil meter mechanism to measure alternating current and voltage, it should be used with a rectifier. A rectifier converts alternating current (AC) into direct current (DC). Since the meter is designed to measure direct current, its readout will only be correct if the input AC is rectified. This enables it to display the magnitude of the alternating current or voltage as a steady reading, reflecting the average value of the rectified waveform. Rectifiers commonly use semiconductor diodes to achieve this conversion.