Advertisements
Advertisements
प्रश्न
How is kilowatt hour related to joule?
Advertisements
उत्तर
1 kWh is the work done by a source of power 1 kW in 1 h, i.e.,
1 kWh = 1 kW × h = 1000 J s-1 × 3600 s = 3.6 × 106 J
1 Kilowatt hour = 3.6 × 106J
APPEARS IN
संबंधित प्रश्न
How is the unit horsepower related to the S.I. unit of power?
A mechanic can open a nut by applying a force of 200 N while using a lever handle of 50 cm length. How long handle is required if he wants to open it by applying a force of only 50 N?
What do you mean by uniform circular motion?
Work is a scalar quantity because it is a measure of transfer of energy without indicating any direction
An engine does 54,000 J of work by exerting a force of 6000 N on it. What is the displacement in the direction of the force?
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B of same mass does the same in 15 s. Compare the power developed by the persons A and B.
A boy takes 3 minutes to lift a 20 litre water bucket from a 20 m deep well, while his father does it in 2 minutes. Compare:
- the work, and
- power developed by them.
In the following case write yes, if the work is being done and no if no work is being done.
A man trying to push a wall.
Calculate the work done when:
A car is moved on a rough road through 30 m against a frictional resistance of 75 N.
