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It consumes one kilowatt hour of electric energy. The electric energy meter turns 2500 revolutions. It turns 100 revolutions in 2 minutes. How much is the electric energy
2500 RPM / 1kwh = 100 RPM / E
E=0.04kWh=144000J
If an electric appliance consumes 9600 joules of electric energy in 4 minutes, the power of the electric appliance is w
9600/(60*4)=40W
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