Why do bulbs have two terminals?

A bulb has two terminals, one for sending the current to the filament and the other is for receiving it back. Every electric component has two terminals one to send the current to the device one to receive it back. It is not possible for any device to have only one terminal.A light bulb is a device that produces light from electricity. Light bulbs turn the electricity to light by sending current through a thin wire called filament. The filament is usually made of tungsten, a material that emits light when electricity is passed through it.

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