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najprościej - to układamy proporcję, np :
1,5 MJ = 1500000 J bo 1 MJ = 1000000 J
1 kWh = 3600000 J
x kWh = 1500000 J
x = 1500000 / 3600000 = 0,42 kWh
lub : 5 kWh ile to J ?
1 kWh = 3600000 J
5 kWh - x J
x = 5 * 3600000 = 18000000 J = 18 MJ