The storage battery of a car has an EMF of `12 V`. if the internal resistance of the battery is `0.4 ohms`. What is the maximum current that can be drawn from the battery?

Find the terminal p.d. of the cell when (a) it discharges (b) it is getting charged, when emf of the cell is 1.5 volts, internal resistance of the cell is 0.1 ohm and the cell drives a current of 1 amp.

A 50 volt battery is connected across a 10 ohm resistor. If the current is 4.5 A, calculate the internal resistance of the battery.

The current in a circuit with a cell of e.m.f 6 V and internal resistance 0.1 Omega is 2 A. Find the value of the external resistance in it.