if a metal key is used place of switch in the circuit the bulb
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Explanation:
The devices which deliver electricity are called the sources or lamps, electric engines, etc. which consume electricity are called 'loads'. Switches are used to switch the loads on and off whenever necessary. Hence, the source, the load, and the switch are connected together to form electrical circuits.
The circuit is called 'closed' when the current flows in the circuit, and when the current does not flow, it is called an 'open circuit'. The switch or key helps to make or break the circuit, i.e. switches on or switches off the current.
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