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प्रश्न
Why does the filament of an electric bulb in an electric circuit get white-hot, but not the connecting wires?
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उत्तर
The filament of an electric bulb is made up of tungsten having high resistance. Due to its high resistance, on passing an electric current through it, electrical energy changes into heat energy. So much heat is produced that filament of bulb becomes white-hot and gives light.
The resistance of connecting wires is very low and hence the connecting wires do not get heated.
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संबंधित प्रश्न
Write symbol and state function of following component in an electric circuit : key
Define the term potential difference.
State whether the resistance of filament of a bulb will decrease, remain unchanged or increase when it glows.
Draw a diagram showing two bulbs connected in parallel to a dry cell.
What is the SI unit of resistance?
State three factors on which the resistance of a wire depends. Explain, how does the resistance depend on the factors stated by you.
Compare the brightness of two 60 watt bulbs.
When they are connected in parallel.
Explain giving scientific reasons.
