what is the relation b/w KW and KWH? plz explain with
example.
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Answer Posted / sameer
Watt is the unit of power.
1 Watt = 1 Joule per second i.e. when energy of 1 joule is
consumed in 1 second, then the corresponding power is 1
watt.
Thus, a bulb of 60 watts consumes 60 Joules per second.
KWH (or WH) is nothing but the measure of the actual energy
consumed in Joules per hour...how???
This is how ==>> Watt Hour = Watt X Unit of time
= Joules/Seconds X seconds
= Joules
So, bascially, 100 watt hour = 100 joules/second x 3600
seconds = 360000 Joules i.e. in 1 hour, the 100 watt bulb
has consumed 360000 Joules of enegy.
This is the reason, why electricity companies mention the
watt-hours consumed by the consumer in the bill.
Basically, they are calculating the 'energy consumed' in
the particular month and then charging you a specific rate
for it in terms of Rs. XYZ per unit (of energy).
To give an analogy, watt can be looked upon as the speed of
a car (lets say a taxi)and the watt-hour can be looked upon
as the actual distance travelled. Thus, you might travel at
100 miles per hour or at 50 miles per hour or at different
speeds...but the taxi driver will charge you for the final
distance travelled and not for the speed at which you
travelled.
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