A filament of a bulb becomes hot when an electric current is passed but connecting wires carrying current don't why?

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Solution

A filament has a lot of resistance to electricity. Therefore as a result of this, the filament heats up and becomes red hot and starts glowing, converting electrical energy to light energy.
This is because of the Joule effect, which means that resistances heat up when the electrical current runs through them.
A wire has a lot less resistance when compared to the filament of the bulb so it doesn't heat up.

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