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प्रश्न
What changes in energy occur in an electric heater?
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उत्तर
In an electric heater, electrical energy changes to heat energy.
संबंधित प्रश्न
The diagram below shows a circuit containing a lamp L, a voltmeter and an ammeter,. The voltmeter reading 3 V and the ammeter reading is 0.5 A.
What is the resistance of the lamp?
What is the power of the lamp?
The commercial unit of energy is :
(a) watt
(b) watt-hour
(c) kilowatt-hour
(d) kilo-joule
Why is an electric light bulb not filled with air? Explain why argon or nitrogen is filled in an electric bulb.
An electric kettle is rated 2.5 kW, 250 V. Find the cost of running the kettle for two hours at Rs. 5.40 per unit.
Calculate the resistance of an electric bulb which allows a 10 A current when connected to a 220 V power source.
A coil of copper wire is connected to a galvanometer. What would happen if a bar magnet is:
(i) Pushed into the coil with its north pole entering first?
(ii) Held at rest inside the coil?
(iii) Pulled out again?
What does the unit kilowatt hour measure? Define it.
