Can the terminal potential difference of a cell exceed its e.m.f. ?

Show that the terminal potential difference of a cell connected in a closed circuit is , in general,less than its emf.

As the current drawn from the cell increases, terminal potential difference of a cell is

The terminal potential difference of a cell when short-circuited is (E = E.M.F. of the cell)

Give three differences between e.m.f. and terminal potential difference of a cell.

Why is that the terminal potential difference is always less than the e.m.f. of a cell?