Power: energy provided per unit of time. Energy is measured in joules (J) and power is measured in Watts (W). A watt is equal to a joule per second.
1 kW = 103 Watt or 1000 W
1 MW = 106 Watt or 1000 kW
1 GW = 109 Watt, or 1000 MW

 

Energy: power multiplied by time during which it is applied. Energy is measured in joules (J) and power is measured in Watts (W). A joule is equal to a watt during 1 second.
1 kJ = 103 J or 1000 J
1 MJ= 106 J or 1000 kJ
1 GJ= 109 J, or 1000 MJ

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