Physics
Grade-10
Easy
Question
What is the wasted energy when a bulb is switched on?
- Electrical
- Chemical
- Heat
- Light
Hint:
Heat energy
The correct answer is: Heat
- When the bulb is turned on, an electrical current passes through the filament, heating it up so much that it emits light.
- The thermal energy that is produced by the light bulb is often called wasted heat, because it is difficult to use this form of energy to do work.
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