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    				| 1. | (i) Write an expression for the electrical energy spent in the flow of current through an electrical appliance in terms of I, R and t. (ii) At what voltage is the alternating current supplied to our houses ? (iii) How should the electric lamps in a building be connected ? | 
| Answer» (i) We know that E = VIt = I2Rt. (ii) 220V – 240V (iii) In a building, Electric lamps are connected in parallel | |