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Monday, 14 January 2013

Pointer type moving galvanometer

Pointer type moving galvanometer

The suspended coil galvanometers are very sensitive. They can measure current of the order of 10-8 ampere. Hence these galvanometers have to be carefully handled. So, in the laboratory, for experiments like Wheatstone's bridge, where sensitivity is not required, pointer type galvanometers are use. In this type of galvanometer, the coil is pivoted on ball bearings. A lighter aluminium pointer attached to the coil moves a scale when current is passed. The restoring couple is provided by a spring.

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