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Deduce the simple relation e=I(R+r) for ...

Deduce the simple relation `e=I(R+r)` for the following circuit :

e = emf of the cell, R = external resistance and
r = internal resistance.

Text Solution

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Let I be the current through the ciruit
e - the emf of the cell
R-ecternal resistance
r-internal resistance of the cell
emf of the cell = PD across R + PD across r
`e=IR+Ir`
`e=I(R+r)`
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