derivation of cells in series and parallel - free help in physics - plustwophysics.pdf

8/14/2019 DERIVATION OF CELLS IN SERIES AND PARALLEL - Free Help in Physics - PlusTwoPhysics.pdf

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10/21/13 DERIVATION OF CELLS IN SERIES AND PARALLEL - Free Help in Physics - PlusTwoPhysics

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The total internal resistance = nr (since the internal resistances come in series)

The total resistance in the circuit = nr+R

The total emf = nE (since the emfs add up in series circuit)

Therefore, the current in the circuit;

PARALLEL COMBINATION OF CELLS

Consider m identical cells of emf E and internal resistance connected in parallel across an external resistor of resistance R.

The total emf in circuit = E (Since each cell has the same emf and they are in parallel)

The net internal resistance = r/m (since the cells are in parallel, their resistances are also in parallel. If m identical resistances are in parallel, the effective resistance

is r/m)

The total resistance in circuit = R + r/m

Therefore, the current in circuit;

MIXED COMBINATION OF CELLS

Consider a combination of m rows of n cells each. The emf of each cell is E and the internal resistance of each cell is r. This combination is connected across and

external resistance R.

The total EMF = nE

The net internal resistance = nr/m

The total resistance in circuit = R + nr/m

The current in circuit;
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2 comments- What do you think? Posted by admin - February 15, 2011 at 2:41 pm

Categories: Current Electricity Tags: answer, cell, combination of cells, derivation, emfs, external resistor, internal resistance,parallel combination, singh,

treatment

2 Responses to DERIVATION OF CELLS IN SERIES AND PARALLEL

1. jaipreetsays:

February 16, 2011 at 4:28 pm

thank u very much for clearing my doubt..

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2. bhagyashrisays:

August 3, 2011 at 10:09 pm

thnks..!! dis also heplped me..!!!

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