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प्रश्न
A cell of emf E and internal resistance r is connected with a variable external resistance R and a voltmeter showing potential drop V across R. Obtain the relationship between V, E, R and r.
अति संक्षिप्त उत्तर
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उत्तर
For a cell with EMF (E) and internal resistance r:
V = E − Ir
Sunstituting = `V/R`
Rearranging:
`V(1 + r/R)` = E
V = `(ER)/((R + r))`
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