- #1

mjosephh

- 5

- 0

I am having trouble finding the Vg for a problem involving a Wheatstone Bridge circuit. If I am labeling the problem correctly, R1=40, R2=70.0 R3=50.0 and R4=20.0.

Voltage - in = 20.0V

I am using the formula: ((R1*R3) - (R2*R4) *V-in) / (R1 + R2) * (R4+R3) to find Vg between points B and D.

R1=40 (resistance between points A and B)

R2=70 (resistance between points B and C)

R4=20 (resistance between points A and D)

R3=50 (resistance between points C and D)

+ -

V-in = 20V

2. I think my problem is that I don't know what to do with the resistance of Vg (between points B and D), which is 60.0 ohms.

3. The answer for Vg in the book is 0.94 V, and I am getting 1.56V. What am I doing wrong?