Derive the relation between watt hour and joule
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A Joule of energy is delivered when 1 Watt of power is applied for 1 second. A KwH is a thousand Watts applied for 60 X 60 seconds so a KwH is 1000 x 60 x 60 Joules. = 3600000 J or 3.6 MJ.
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1watt hour =60 joules per hour
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