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A series battery of 10 lead accumulators...

A series battery of 10 lead accumulators each of emf 2V and internal resistance 0.25ohm is charged by a 220V d.c. mains. To limit the charging current a resistance of 47.5 ohm is used in series in the charging circuit. What is (a) the power supplied by the mains and (b) power dissipated as heat? Accout for the difference of power in (a) and (b).

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