w=p×t=200W×3600s=720000J=720kJ
kWh=0.2kW/1h=0.2kWh
70×⅕=14gr
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w=p×t=200W×3600s=720000J=720kJ
kWh=0.2kW/1h=0.2kWh
70×⅕=14gr