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प्रश्न
How many joules are there in one kilowatt-hour?
How many joules are equal to 1 kW h?
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उत्तर
There are 3.6 × 106 J in one kilowatt-hour.
संबंधित प्रश्न
Fill in the blank
An electric fan converts electrical energy into ______ energy.
Fill in the blank
Cooking gas converts _______ energy into heat energy.
Fill in the blank
The ability to do work is called ______
State two factors on which the potential energy of a body at a certain height above the ground depends.
Match the following:
| Column A | Column B |
| (a) Needle | (1) class II lever |
| (b) Doorknob | (2) inclined plane |
| (c) Ramp | (3) Class I lever |
| (d) Lemon crusher | (4) Wheel and axle |
| (e) Seesaw | (5) wedge |
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Answer the following in short.
What do you understand by the term efficiency of a machine’?
Give a reason for the following.
The efficiency of a machine is always less than 100%.
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Name the quantity whose unit is :
(a) kilowatt
(b) kilowatt-hour
The commercial unit of energy is :
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