NCERT Exemplar XXII — task. Science CBSE, Class 10.

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Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of $2\ Ω$ in series with a combination of two resistors ( $4\ Ω$ each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the $2\ Ω$ resistor be the same as that across the parallel combination of $4\ Ω$ resistors? Give reason.

Total resistance for the parallel combination is

$\begin{array}{l} \frac{1}{R} = \frac{i}{i_{i}} + \frac{i}{i_{i}} \\ = \frac{i}{i} \\ R = i Ω \end{array}$

The resistance of resistors in parallel combination is resistance of series resistor. Hence, the potential difference across

$2\ Ω$ resistance is the as potential difference across the other two parallel resistors.

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81. NCERT Exemplar XXII

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