The resistors R1, R2, R3 and R4 in the figure given below are all equal in value.
The resistors R_{1}, R_{2}, R3 and R_{4} in the figure given below are all equal in value.
R_{eq} = R + R + R + R = 4R ohm
Total current in the circuit, I = \(\frac{V}{R}\)
= \(\frac{12}{4R}\) = \(\frac{3}{R}\)
Reading of voltmeter A = Voltage across R_{1 }= I x R_{1} = \(\frac{3}{R} \times R\) = 3V
Reading of voltmeter A = Voltage across R_{2 }= I x R_{2} = \(\frac{3}{R} \times R\) = 3V
Reading of voltmeter C = Voltage across the series combination of R_{3 }and R_{4 }= I x (R_{3 }+ R_{4})
= \(\frac{3}{R}\) x 2R
= 6V

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