THEORY OF GROUPING OF TWO DIFFERENT CELLS

– Two cells of different EMF and Internal Resistance in Series and Parallel.

1. When a number of cells are connected in series, the net emf is equal to the sum of their individual emfs.

E = E1 + E2 + . . . + En

2. If a cell (say E2) is connected oppositely, then E2 is to be replaced by –E2.

Hence E = E1 – E2 but r = r1 + r2.

ie. Internal resistance is always +ve irrespective of the way a cell is connected.

3. The emf of a cell is taken as +ve if current flows out of its +ve terminal (ie. when current inside the cell is from the –ve to the +ve)

4. The emf of a cell is independent of the external resistance connected in the circuit.

FOR MORE DETAILS, WHICH NEEDS EQUATION, PLEASE VIEW THE FOLLOWING DOCUMENT

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