Permanent Magnet Moving Coil Instrument PMMC, Overview:

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 Permanent Magnet Moving Coil Instrument PMMC, Overview:


PMMC means permanent magnet moving coil. It is analogue instrument which is used for measuring the current. It is also known as D’Arsonval meter. In this instrument there are two things one is permanent magnet which is an object or material that generates a magnetic field and other is moving coil through which current will flow. Permanent magnet will be used to generate magnetic field the magnetic field generated by this permanent magnet will not visible to the naked eye. It is solely responsible for the unique property of a magnet that attracts ferromagnetic metals such as iron, cobalt and nickel. It either attracts or repels other magnets. A permanent magnet moving coil (PMMC) instrument cannot measure ac current. It can measure only direct current (DC). We can make ammeter and voltmeter from PMCC.


The current that we need to measure is passes through the moving coil as we know that this coil is placed in two permanent magnets so according to Lorentz force law any current carrying conductor which is kept in magnetic field will experience a force and that force can be experience.

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