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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
Name the instrument used to control the current in an electric circuit.
Write symbol and state function of following component in an electric circuit :
voltmeter
‘The potential difference between two conductors is 1 volt.’ Explain the meaning of this statement.
Name the physical quantitiy of which the unit is ampere
State two conditions necessary for a circuit, such that electric current flows through it.
Is electric current a scalar quantity?
Compare the brightness of two 60 watt bulbs.
When they are connected in series.
Explain giving scientific reasons.
