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a) Three bulbs in series :
Power dissipated in a resistance is given by the following expression :
P = VI = I^2R = V^2/R .......(1)
Power rating of a resistance gives the power dissipation that will take place in the resistance when full rated voltage is applied across it. Thus, 60 W bulb will dissipate 60 W power if full ...
Step by step solution provided.