How does the filament of an electric bulb glow? Write the disadvantage of an incandescent bulb.
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When filament is heated at high temp. then it glows, it can't melt easily as it is having melting point of 3373°c.
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The electric bulb filament glow with the help of temperature heat up that is worked out at the temperature of 3373 degree Celsius.
The main disadvantage of the Incandescent Bulb is:
• Inefficient energy
• Short lamp lifetime
• Source of the lamp is warm and the room will require cooling down with coolant
• The operating cost is high
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