3. When does the bulb lights up?
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7
Answer:
An electric bulb glows when the circuit is complete and current flows through it. When a bulb fails to glow even if it is not fused, it means that the electric current is not flowing through the circuit.
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10
Answer:
When a light bulb connects to an electrical power supply, an electrical current flows from one metal contact to the other. As the current travels through the wires and the filament, the filament heats up to the point where it begins to emit photons, which are small packets of visible light.
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