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If you look up a torch bulb closely, you will see that there is fine wire inside, which lights up when electricity passes through it. The electric bulbs we use to light up our homes are the same, but they use a much stronger kind of electricity . This comes into our homes through thick wires, or cables.
Main electricity is very useful but it is very dangerous. Never try to look inside electric plugs and sockets or play about with any electrical equipment . You could get an electric shock that would hurt you.
When you press the button on an electric bell, electricity from the battery makes the striker hit the bell.
