What will happen if we will not have switch in a circuit
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The terms “open” and “closed” refer to switches as well as entire circuits. An open switch is one without continuity: electrons cannot flow through it. A closed switch is one that provides a direct (low resistance) path for electrons to flow through.
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If there's no switch we cannot control the circuit. {when the circuit board is in closed loop with power supply} the current will go on the circuit will be on with live current. If we have a switch we get to control the circuits current.
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