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The resistors R1, R2, R3 and R4 in the figure given below are all equal in value.

  

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The resistors R1, R2, R3 and R4 in the figure given below are all equal in value.

What would you expect the voltmeters A, B and C to read assuming that the connecting wires in the circuit have negligible resistance?
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Req = 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 R1 = I x R1 = \(\frac{3}{R} \times R\) = 3V

Reading of voltmeter A = Voltage across R2 = I x R2 = \(\frac{3}{R} \times R\) = 3V

Reading of voltmeter C = Voltage across the series combination of R3 and R4 = I x (R3 + R4)

= \(\frac{3}{R}\) x 2R

= 6V

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