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संबंधित प्रश्न
1 kWh = ________ J
A bulb is rated as 250 V; 0.4 A. Find its : (i) power, and (ii) resistance.
An electric motor takes 5 amperes current form a 220 volt supply line. Calculate the power of the motor and electric energy consumed by it in 2 hours.
An electric kettle connected to the 230 V mains supply draws a current of 10 A. Calculate:
(a) the power of the kettle.
(b) the energy transferred in 1 minute.
Name two gases which are filled in filament type electric light bulbs.
In a filament type light bulb, most of the electric power consumed appears as:
(a) visible light
(b) infra-red-rays
(c) ultraviolet rays
(d) fluorescent light
When a current I flows through a resistance R for time t, the electrical energy spent is given by:
(a) IRt (b) I²Rt (c) `IR^2t` (d) `I^2R ⁄t`
An electric bulb of resistance 500 Ω draws current 0.4 A from the source. Calculate:
- the power of bulb and
- the potential difference at its end.
What is the energy conversion when an electric current passes through a metallic wire?
How can electric energy consumed by an electric appliance be calculated in kilowatt hour (kWh)?
