Question : In a filament-type light bulb, most of the electric power consumed appears as
Option 1: visible light
Option 2: infrared rays
Option 3: ultraviolet rays
Option 4: fluorescent light
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Correct Answer: infrared rays
Solution : The correct option is infrared rays .
The majority of the electricity used by an incandescent filament light bulb is converted to heat instead of visible light. This is because a tiny tungsten filament is heated to create light in incandescent lamps. Heat is produced when electricity hits resistance as it travels through the filament. The filament starts to emit visible light and a large quantity of infrared radiation as it heats up. Incandescent bulbs are particularly poor in converting electrical energy into visible light because a significant amount of it is still released as heat.
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