Two cells, of e.m.f. 2E and E, and internal resistance 2 r and r respectivley are connected in parallel. Obtain the expression for the equivalent e.m.f and the internal resistance of the combination?

Two cells of e.m.f.6V and 12V and internal resisatnce lohm and 2ohm respectively are connecetd in parallel so as to send current in the same direction through an external resistance of 15ohm. calculate current in each branch of the circuit (c) potential difference across the 15 ohm resistor.

Two cells of e.m.f.6V and 12V and internal resisatnce lohm and 2ohm respectively are connecetd in parallel so as to send current in the same direction through an external resistance of 15ohm. Draw the circuit diagram.

Four identical cells of emf epsilon and internal resistance r are to be connected in series. Suppose, if one of the cell is connected wrongly, then the equivalent emf and effective internal resistance of the combination is

n cells, each having emf. E and internal resistance r are connected in parallel. What is the net internal resistance of the combination?

Two cells of e.m.f E_1 and E_2 have internal resistance r_1 and r_2 respectively. What is the corresponding formula for the series combination?

A battery of e.m.f E and internal resistance r sends a current I_1 and I_2 , when connected to an external resitance of R_1 and R_2 respectively. Find the e.m.f and internal resistance o the battery.

Write down the relation between the e.m.f. of a cell and its internal resitance.