How does a bulb glow when the switch is turned on?
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A.
The filaments touch each other
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B.
The filaments expand
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C.
The filaments get heated up due to current and lights up
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D.
Current does not flow through circuit
Correct Answer:
C. The filaments get heated up due to current and lights up
Explanation:
When an electric switch is turned on, the circuit is completed, allowing an electric current to flow through the bulb's filament. Because the filament is made of a material with high resistance, the passage of this current generates significant heat. This process, known as resistance heating, causes the filament to reach a temperature where it glows intensely, thereby emitting visible light. Consequently, the bulb illuminates as a direct result of the filament being heated by the electrical flow.
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