A car has a fresh storage battery of emt `12 V` and internal resistance `5.0 xx 10^(-2) Omega`. If the starter moter 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 storange battery increase to `500 Omega`. What maximum current can be drawn from the battery? Assume the emt of the battery to remain unchanged.
(c) If the discharged battery is changed by an external emf source, is the terminal voltage of the battery during changing greater of less than is emf `12 V`?

Answer

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