thumb|320px|An early D'Arsonval galvanometer showing magnet and rotating coil
A galvanometer is an instrument that detects and measures small electric currents by using a magnet to make a coil rotate, with the amount of rotation indicating the strength of the current. It was an important early tool for studying electricity and became the foundation for modern electrical measuring devices like ammeters and voltmeters.
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thumb|320px|An early D'Arsonval galvanometer showing magnet and rotating coil
A galvanometer is an electromechanical measuring instrument for electric current. Early galvanometers were uncalibrated, but improved versions, called ammeters, were calibrated and could measure the flow of current more precisely. Galvanometers work by deflecting a pointer in response to an electric current flowing through a coil in a constant magnetic field. The mechanism is also used as an actuator in applications such as hard disks.
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