The number of cycle per second of the alternating quantity is known as the frequency. The instruments used to measure frequency called Frequency Meter.
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In Moving Iron instruments (or MI Instruments), an iron piece moves, when repelled (or attracted) by the magnetic field of a coil. With the moving piece, a pointer is attached which shows deflection on a calibrated scale. These instruments are simple, cheap and reasonably accurate and can be used for ac/dc measurements hence find extensive
Moving Iron Instrument (or MI Instrument) – Working, Diagram & Types Read More »