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Question -

(a) Sixlead-acid type of secondary cells each of emf 2.0 V and internal resistance of0.015 Ω are joined in series to provide a supply to a resistance of 8.5 Ω. Whatare the current drawn from the supply and its terminal voltage?

(b) Asecondary cell after long use has an emf of 1.9 V and a large internalresistance of 380 Ω. What maximum current can be drawn from the cell ? Couldthe cell drive the starting motor of a car ?



Answer -

(a) Six cells are joined in series.

Equivalent emf is 2 × 6 = 12 V
Equivalent internal resistance is 0.015 × 6 = 0.09 Ω
Current drawn from supply
(b) Maximum current is drawn from a battery when external resistanceis tested to be zero

To start a car, a current of the order of 100A is needed, so the battery mentioned above can not drive the starting motor.

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