How Does a Switch Work on a Circuit?

By Staff WriterLast Updated Mar 27, 2020 12:26:11 PM ET
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steve lodefin/CC-BY-2.0

A switch works by interrupting current flow around an electrical circuit. A basic switch is a binary device: it is either open (off) or closed (on). The simplest type of switch is one that comprises two metal strips that are brought into contact by a spring or some other form of actuating mechanism.

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