Question

what is a switcher in physics

Answer 1

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A $<b >Switch</b >$ in physics is an instrument or an object which is used in a complete circuit to obstruct or let the flow of electric current through the circuit to make it a closed circuit.

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Answer 2

An electric light will only glow if it is part of a complete circuit, meaning that current from the power company must flow through wires to the light and then return through wires to the power company for reuse. ... When you flip the lever of an SPDT switch, you connect the single wire to the other one of the pair....
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