The p.d. between the two terminals of a cell in open circuit is 2 volt. The p.d. falls to 1.5 volts when the cell is connected across a 2 ohm resistance. Find the internal resistance 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.

A capacitor gets a charge of 30muC when it is connected to a cell of 1.5 V. Find the capacitance of the capacitor.

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.

What is the potential difference between two terminals of cell of emf of 6V in the open circuit ? Neglect the internal resistance of the cell.