The filament of an electric bulb glows because, when electric current flows through it,
(a) a chemical reaction takes place
(b) the filament heats up
(c) the terminals heat up
(d) the filament cools down

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Solution

(b) the filament heats up
The filament of an electric bulb glows because, when electric current flows through it, the filament heats up.

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When electric current passes through the filament of a bulb, it gives off:

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