Four cells of e.m.f. 2.5 V each are connected in series to form a battery, the e.m.f. of the battery is `"_______"`.

Four cells, each of e.m.f 1.5 V, are connected in series to form a battery. Find the e.m.f of the bettery.

Three cells of 1.5V, 2.5V and 3.5 V, respectively, are connected in series to form a battery. Find the e.m.f of the battery.

Three identical cells of e.m.f. 1.5 V are connected in parallel. The total e.m.f. of the combination is "_____" .

Five dry cell each of e.m.f 1.5V are connected in parallel. The e.m.f of the combination is

Two batteries A and B each of e.m.f. 2 V are connected in series to an external resistance R = 1 ohm . If the internal resistance of battery A is 1.9 ohms and that of B is 0.9 ohm , what is the potential difference between the terminals of battery A

Two batteries A and B each of e.m.f. 2 V are connected in series to an external resistance R = 1 ohm . If the internal resistance of battery A is 1.9 ohms and that of B is 0.9 ohm , what is the potential difference between the terminals of battery A

If six identical cells each having an e.m.f. of 6 V are connected in parallel, the e.m.f. of the combination is