Sources of emf and Kirchhoff's laws

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Question

In the given circuit, the voltmeter and the electric cell are ideal. The reading of the voltmeter (in volt) is __________

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Solution

The electric current through ideal voltmeter is zero.
According to loop rule,
$\begin{array}{l} E - 1 \times i - 1 \times i = 0 \Rightarrow i = \frac{E}{2} = \frac{2}{2} = 1 A \\ Reading of the voltmeter = V_{A} - V_{B} = [1 \times i] = [1 \times 1] = 1.00 V \end{array}$

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