BATTERY
Battery is as part of a circuit that provides the electricity. Battery can be said as the source to provide electricity to the circuit.
So its main function is to supply electric power in order for electric items to work.
LIGHT BULB
A light bulb is that component of circuit that lights up when electricity flows through it and vice versa.
Its main function is to tell whether electricity is being supplied or not. Its function is also to light up dark places.
SWITCH
Switch is something that can make a gap in a circuit, to turn things on or off. Basically it is the main component of electricity that controls the electricity that flows through light items by turning it on or off.
Its main function is to turn on or off the power of electricity flowing through wires.
WIRES
Wires are used to join parts of a circuit. Electricity flows through wires.
Its main function is to provide electrical items the power they need to work, provided by battery.
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