Which is smaller, terminal-p.d. or e.m.f. of a cell and why ?

The e.m.f. of a cell is a

The e.m.f. of a cell is always

The e.m.f. of a cell depends on

E.m.f. of a cell is measured in

Why is the terminal voltage of a cell is less than its emf?

How is DeltaG related to e.m.f. of the cell ?

Why is terminal voltage of a cell less than its emf ?

A potentiometer wire is 10 m long and a P.D. of 6 V is maintained between its ends. The e.m.f. of the cell which balances against a length of 200 cm of the potentiometer wire is