The total amount of energy transferred by an appliance depends on power and time.
What is power?
Power is rate of doing work or rate of consumption of energy .It's unit is watt.
So p = E/t
Where, P = Power
E = Energy consumed
t = time taken
so , E = p x t
Hence energy transferred depends on power and time . The unit of electrical energy consumed is watt-second or joules. It's commercial unit is kWh(kilowatt-hours). The less the time taken by an appliance to do the work , the more is the power of the appliance
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