SOLUTION

• To measure AC voltage with a moving coil meter, you need a rectifier.
• Moving coil meters are inherently DC devices.
• To measure AC voltage, the AC signal must first be converted to DC. A rectifier does this by allowing current to flow in only one direction, effectively changing the alternating current into a direct current.
• The moving coil meter can then measure the average value of this rectified current, with the scale calibrated to display the corresponding RMS AC voltage