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A kilowatt hour is 1000 joules per second over 3600 seconds, the amount of power a 1kW heater uses in 1 hour. Its as metric as the hectare


And 1 Joule is one Newton-metre (i.e. it takes 1 J to pull with a force of 1 N over a distance 1 m).


You are right. I'd say it is metric, if not standard SI. 1 kWh = 3.6 MJ.




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