A resistance R is connected across a cell of emf e and internal resistance r. A potentio meter now measures the potential difference between the terminals of the cell as V. Write an expression for r in terms of e, V and R.
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Hi..
We have,
E, r and R are in series.
The equivalent resistance of the circuit is = (r+R)
Current through the circuit is, I = E/(r+R)
So, voltage drop across R is, V = IR = ER/(r+R)
=> V = E/(1+r/R)
Hope this helps u !!
We have,
E, r and R are in series.
The equivalent resistance of the circuit is = (r+R)
Current through the circuit is, I = E/(r+R)
So, voltage drop across R is, V = IR = ER/(r+R)
=> V = E/(1+r/R)
Hope this helps u !!
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