Advertisements
Advertisements
Question
How is kilowatt hour related to joule?
Advertisements
Solution
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
RELATED QUESTIONS
How is the unit horsepower related to the S.I. unit of power?
What are the S.I. and C.G.S units of work? How are they related? Establish the relationship.
The moment of a force 10 N about a point 0 is 4 Nm. Calculate the distance of point of application of force from the point 0.
What is a centripetal force?
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.
How much work each does? Take density of water = 103 kg m-3 and g = 9.8 N kg-1.
State the condition when the work done by the force is positive
State the condition when the work done by the force is negative.
State the practical unit mainly used in mechanical engineering and write down its equivalent in watt.
A coolie carries a load of 30 kgf through a distance of 500 m in 5 minutes while another coolie B carries the same load through the same distance in 10 minutes. Compare the
(i) work done, and
(ii) power developed. (Take: g = 10md−2)
