what is close circuit and open circuit ?
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An open circuit is one where the continuity has been broken by an interruption in the path for current to flow. A closed circuit is one that is complete, with good continuity throughout. A device designed to open or close a circuit under controlled conditions is called a switch.
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When the key is closed, then the circuit is called closed circuit. This means that current would flow through the circuit to operate the device. When the key is open then the circuit is called open circuit. This means that current would not flow through the circuit.
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