A cell of terminal p.d. of 10 volts drives a current of 2 Amperes calculate the emf of the cell if its internal resistance is 0.5 ohm.

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 dry cell of internal resistance 0.1 ohm drives current of 20 A when the cell is not short circuited. Find the emf of the cell. Find the terminal p.d. when the cell is open circuited.

A cell of emf E and internal resistance r drives a current of 5 Ampere through an extenal resistance of 8 ohm. The current drops to 4 Ampere when the external resistance is increased to 10.1 ohm. Find the emf E and the internal resistance r of the cell.

Find relation between emf and internal resistance of a cell.

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.