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Filament bulbs are hot, but some other bulbs like LED, CFL are cold. Guess, what is the reason?

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Filament bulbs are hot, but some other bulbs like LED, CFL are cold. Guess, what is the reason?

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1. Filament bulbs are made up of Tungsten filaments. 

2. These are working on the principle of heating effect of the electricity. 

3. So, they are hot. 

4. But, other bulbs like CFL and LED are not working on this principle. Hence they are cool.

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