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Find the energy in \(kWh\) consumed in \(10\ hours\) by four devices of power \(500\ W\) each.
 
The formula to calculate the energy consumed by an electric device is,
 
 
Substitute the values,
 
Energy consumed by an electric device \(=\)  \(kWh\)
 
Energy consumed by four equal rating devices \(=\)  \(kWh\)