(a)A car has a fresh storage battery of emf `12 V` and internal resistance `5.0 xx 10^(-2) Omega`. If the starter motor draws a current of `90A`, what is the terminal voltage of the battery when the starter is on?
(b) After long use, the internal resistance of the storage battery increase to `500 Omega`. What maximum current can be drawn from the battery? Assume the emf of the battery to remain unchanged.
(c) If the discharged battery is charged by an external emf source, is the terminal voltage of the battery during charging greater or less than its emf `12 V`?

Answer

(a) 7.5 V,
(b) 24 mA
( c) greater then 12V.