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प्रश्न
State three factors on which the heat produced in a metallic wire due to passage of current in it depends.
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उत्तर
(i) On resistance of wire.
(ii) On strength of current through the wire.
(iii) On time for which the current flows in the wire.
संबंधित प्रश्न
If a bulb of 60W is connected across a source of 220V, find the current drawn by it.
Name the commercial unit of electric energy.
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?
An electric bulb is rated 250 W, 230 V. Calculate:
- the energy consumed in one hour
- the time in which the bulb will consume 1.0 kWh energy when connected to 230 V mains.
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?
A consumer uses 4 lamps of 60 watt, 2 lamps of 40 watt, and 2 lamps of 100 watt. All these are used for 6 hour daily. Find the total bill for 30 days when the rate of energy is 75 paise per unit and the meter rent is Rs. 1.
A torch bulb is rated at 3 V and 600 mA. Calculate it’s
- power
- resistance
- energy consumed if it is used for 4 hours.
Unit of electric power may also be expressed as:
What is the meaning of electric power of an electrical device? Write its SI unit.
