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प्रश्न
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उत्तर
P = VI = I2 R = `"V"^2/"R"`
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संबंधित प्रश्न
Name the commercial unit of electric energy.
An electric kettle for use on a 230 V supply is rated 3000 W. For safe working, the cable connected to it should be able to carry at least:
(a) 2 A
(b) 5 A
(c) 10 A
(d) 15 A
A bulb of 40 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.
What is the resistance, under normal working conditions of a 240 V electric lamp rated at 60 W? If two such lamps are connected in series across a 240 V mains supply, explain why each one appears less bright.
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.
State three factors on which the heat produced in a metallic wire due to passage of current in it depends.
Why is a concave reflector placed behind the heating element in a room heater.
How does the heat produced by die passage of current in a metallic wire depend on the resistance of the wire.
1 kWh is equal to:
The average work done by a human heart while it beats once is 0.5 Joule. The power used by heart if it beats 72 times in a minute:
