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प्रश्न
An electric heater is rated 220 V, 550 W. Electrical energy is also measured in kWh. What do you understand by a kilo-watt-hour?
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उत्तर
The energy consumed in a resistor when the potential difference is 1V and 1A current flows for 1000 hrs.
संबंधित प्रश्न
At a given time, a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulb could be switched on in the house at the same time (if they are all connected in parallel)?
Electrical power P is given by the expression P = (Q × V) ÷ time. What do the symbols Q and V represent?
1kWh = …….. J
An electrical appliance having a resistance of 200Ω is operated at 200 V. Calculate the energy consumed by the appliance in 5 minutes (i) in joules (ii) in kWh.
A current of 0.2 A flows through a wire whose ends are at a potential difference of 15 V.
calculate:
(i) the resistance of the wire and
(ii) the heat energy produced in 1 minute.
Why is heating element wound on a long porcelain rod in a room heater.
Which material is the calorimeter commonly made of? Give one reason for using this material.
Why is the electric power from the generating station transmitted at high voltage?
State the reason why, in a three-pin plug, the earth pin is longer and thicker than the other two.
An Electric bulb is marked 100 W, 230 V. What how long would this lamp take to consume one unit of electricity?
