Discuss the grouping of two unidentical cells in(i) series and (ii) parallel and find their equivalent emf and internal resistance.

If three cell are connected in parallel then equivalent emf……. and equivalent internal resistance is …..

The emf of a cell having internal resistance is

If n cells each of emf E and internal resistance rare connected in parallel, then the total emf and internal resistances will be

The e.m.f and internal resistance of two cells are varepsilon_(1),varepsilon_(2) and r_(1) and r_(1) respectively,are connected in series with an external resistance R . Derive an expression for equivalent e.m.f and internal resistance.

Two conductors of resistance R_(1) (50 +- 2) ohm and R_(2) = (100 +- 4) ohm are connected in (a) series and (b) parallel. Find the equivalent resistance.

Five cells each of emf E and internal resistance r are connecte in series. Due to oversight one cell is connected wrongly . The equivalent emf and internal resistance of the combination is

Two batteries each of E and internal resistance r are connected turen by turn in series and in parallel, and areused to find current in an external resistance R . If the current in series is equal to that in parallel, the internal resistance of each battery is