Filaments are present in bulbs.

incandescent

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CFL

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LED

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all types of

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Solution

The correct option is A incandescent
Filaments, usually made from high resistance and high melting point mateials, were found in the incandescent bulbs only. Because of the heavy loss of electric power in form of heat, these filament bulbs were replaced by CFL bulbs which didn't have any filament.

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Filaments are present in bulbs.

The correct option is A incandescentFilaments, usually made from high resistance and high melting point mateials, were found in the incandescent bulbs only. Because of the heavy loss of electric power in form of heat, these filament bulbs were replaced by CFL bulbs which didn't have any filament.

The correct option is A incandescent
Filaments, usually made from high resistance and high melting point mateials, were found in the incandescent bulbs only. Because of the heavy loss of electric power in form of heat, these filament bulbs were replaced by CFL bulbs which didn't have any filament.