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A switch is necessary to be able to turn the electrical circuit on and off, otherwise it would stay "on" all the time, until either the source of power stops giving out power - like a battery which goes dead - or part of the circuit stops working, like a light bulb that fails to work after a long time or a that motor siezes-up, overheats and eventually burns out.

Even if you just disconnect a wire from the source of power, you are doing the same thing as a switch.

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14y ago

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