Engineering Board Exam Reviewer · Branch, Loop and Node Analyses · medium
In the circuit shown, I1=8 A, I2=2 A, R1=20, , R2=8, , and R3=4, . Use nodal analysis, with the bottom wire as the reference (0 V). Find the voltage at node A.
- 160 V
- 60 V
- 13 V
- 55 V
Answer
D. 55 V
Solution
Node A: I1=VA/R1+VA-VB/R2 8 A=VA/20, +VA-VB/8, . Node B: VA-VB/R2=VB/R3+I2 A-VB/8, =VB/4, +2 A. Solving: VA=55 V and VB=13 V.
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