How must a large number of galvanie cells, each having the same emf `G` and tho same internal resistance r, be connected so that in an external circuit whose resistance is `R` the power out put is maximal ?

Four cells, each of emf E and internal resistance r, are connected in series across an external resistance reverse. Then, the current in the external circuit is

Thousand cells of same emf E and same internal resistance r are connected is series in same order without an external resistance . The potential drop across 399 cells is found to be .

A source of electric current with an emf in_o and an Internal resistance r is connected to an external circuit with a resistance R. What must be the relationship between rand R for the power output in the external circuit to be maximal? What is the efficiency of the current source in this case, provided Lhat the power output in the external circuit is assumed to be the useful out put?

The maximum power dissipated in an external resistance R, when connected to a cell of emf E and internal resistance r, will be

An external resistance R is connected to a cell of internal resistance r. The current in the circuit is maximum when

2A cell having an emf epsilon and internal resistance r is connected across a variable external resistance R . As the resistance R is increased, the plot of potential difference V across R is given by

Two cells , each of emf E and internal resistance r , are connected in parallel across a resistor R . The power delivered to the resistor is maximum if R is equal to

A cell of e.m.f (E) and internal resistance (r) is connected in series with an external resistance (nr.) then the ratio of the terminal p.d. to E.M.F is