EMF of a Cell
An electric cell is a source of energy that maintains a continuous flow of charge in a circuit. It changes chemical energy into electrical energy. It has two electrodes, positive electrode and negative electrode as shown below.
Electric cell has to do some work in maintaining the current through a circuit. The work done by the cell in moving unit positive charge through the whole circuit (including the cell) is called the electromotive force (emf) of the cell.
The maximum current that can be drawn from a cell is for
Options:
(a) R = infinity
(b) R = finite non-zero resistance
(c) `R=0`
(d) `R = r`