A cell is used to send current to an external circuit. (a) How does the voltage across its terminal compare with its emf? (b) Under what condition is the emf of the cell equal to its terminal voltage?

Vinay

3 years ago

(a) A cell’s terminal voltage V is smaller than its e.m.f. when current is taken from it.

∴ Terminal voltage < e.m.f.

(b) The e.m.f. is equal to the terminal voltage when no current is applied.