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    				| 1. | (i) Write an expression for the electrical energy spent in the flow of current through an electrical appliances 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) Electrical energy = I2Rt. (ii) 220 volt. (iii) Electric lamps should be connected in parallel. | |