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(a) Define 1 watt. (b) State the comme...

(a) Define 1 watt.
(b) State the commercial unit of electric energy. Express it in terms of SI unit of energy.
(c) An electric refrigerator rated as 750 W operates 8 hours per day. What is the cost of the energy to operate it for the month of June at Rs. 2.50 per kWh ?

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