Incandescent bulbs

 When an electric current passes through the metalic filament of a light bulb, it produces light: It is callled incandescense

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Heat

The energy that an electric current produce as heat is called the joule effect. It is expressed by the following formula: E=(IxI)xRxT
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Fluorescent tubes

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Inside a fluorescent tube, there is a metalic filament, normally made of tungsten. There is also an inert gas, such as argon, and a small amount of mercury. When an electric current passes through the filament, electrons are emited  into the inert gas.
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