Resistance in a Wheatstone bridge

A simple Wheatstone bridge has arms of R1 = 120 ohm, R2 =100 ohm and R3 =125 ohm. What is the value of R4 for balance? If R4 = 200 ohm and the bridge is driven with a source of 200 V. What is the open circuit voltage?

Solution Summary

The solution provides a detailed and step-by-step explanation (including theory and circuit drawing) for the problem.