Question

Derive an expression for the current in a circuit with external resistance r (a) n identical cells of emf e and internal resistance r are connected in series (b) m identical cells are connected in parallel

Answer 1

I = E/(R+r)
where I = current
E = emf
R = external resistance
r = total internal resistance

For resistors in series;
Total r = r1+r2+rn

For resistors in parallel
Total r.= 1/r1 + 1/r2 + 1/rn

Answer 2

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