find the energy in kwh running dor 10 hours by four devices is 500 w, if the cost per unit is 2 then what will be the cost for the month of janurary.
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Power of each device, P=500 W=0.5 kW
Time for which the devices are used, t=10 hours
Thus energy consumed by 4 devices, E=4×P×t
E=4×0.500×10 kWh
⟹E=20 kWh
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