Raju Verma
75 posts
TimePosted 04/08/2013 18:01:20

Difference in kWH and kW?

Dear Expert


can you please clearify what is the basic differnece between kWH and kW and where we use this properly ,if any example it is better.



raju verma


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Ted Krapkat
536 posts
TimePosted 05/08/2013 05:20:16

re Difference in kWH and kW?

Hello Raju,

The difference between kW and kWh is that;-  kWh is a measure of energy whereas kW is a measure of power or more simply, the rate at which energy is generated or used.

Unfortunately, it is not immediately obvious from the term "kW" that it is a rate of energy usage. But a watt is defined as one Joule per second. ie. 1 W = 1 J/s  or,  1kW = 1000 J/s

Therefore if you have a motor which is rated at 2kW (2000 J/s) and you run it for 1 hour, the total amount of  energy used in that period is;- (2000 J/s * 3600 s) = 7200000 J = 7.2 MJ, which is the same as (2kW * 1hr) = 2kWh.