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electric switch
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electric switch Basic electric circuit, with switch, battery, and lamp.
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electric switch
electric switch Electrical switches. (Top, left to right) Circuit breaker, mercury switch, wafer switch, dual in-line package switch, surface mount switch, reed switch. (Bottom, left to right) Wall switch (U.S. style), miniature toggle switch, in-line switch, push-button switch, rocker switch, microswitch.

electric switch

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Article History

electric switch, device for opening and closing electrical circuits under normal load conditions, usually operated manually. There are many designs of switches; a common type—the toggle, or tumbler, switch—is widely used in home lighting and other applications. The so-called mercury, or “silent,” switch is used extensively for controlling home lighting circuits. The oil switch has its live parts immersed in oil to reduce arcing. The aggregate of switching or circuit-breaking equipment for a power station or a transforming station, frequently located in an outdoor yard (switchyard) beside the station, is usually regarded as switchgear.

This article was most recently revised and updated by Amy Tikkanen.