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Explain why does a bulb lights up when it is switched on.

The current passes through the filament of the bulb and causes the filament to heat up. This causes the filament to glow.

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when power is switched on electricityflows from positive to negative terminal of tungston wire and light is expanded by the reflector

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because the current is able to flow from the positive to negative terminal. t

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this is because the energy burns the filament thus making light glow

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