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electrical tachometer
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electrical tachometer

instrument
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Quick Summary

An electrical tachometer is an instrument that indicates the rotational speed of a shaft, typically in revolutions per minute (rpm). The term "tachometer" comes from the Greek word "tach-" meaning "speed".12

There are several types of electrical tachometers:
* Eddy-current (drag) type: Commonly found in car speedometers, this type uses a rotating magnet to generate eddy currents proportional to the shaft's speed.1
* Electric-generator type: These tachometers generate either alternating or direct current based on the rotational speed.1

A stroboscope can also be used as a tachometer by illuminating rotating objects to make them appear stationary.1

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