# Voltage nodal analysis

#### elhaxx

I'm asked to solve for Vo for this equation. I've set the bottom node to be my reference node before applying nodal analysis. When included in the KCL equation for node at Vb, will the dependent voltage source 20iΔ be negative since the current through that element is leaving node C?
Say, the equation would be: [(Vb-10v)/10Ω]+ (Vb/40Ω)+[(Vb+20iΔ)/20Ω]=0
Thanks!

Related Engineering and Comp Sci Homework Help News on Phys.org

#### anorlunda

Mentor
Gold Member
I moved this to the homework forum. Please post homework questions to a homework forum and fill out the required information.

#### NascentOxygen

Mentor
When included in the KCL equation for node at Vb, will the dependent voltage source 20iΔ be negative since the current through that element is leaving node C?
–20iΔ is the voltage Vc

(typo corrected)

#### berkeman

Mentor
Welcome to the PF.
I'm asked to solve for Vo for this equation.
I see Va, Vb, Vc labeled, but no Vo label. Which voltage are you supposed to solve for? Thanks.

#### DaveE

Welcome to the PF.

I see Va, Vb, Vc labeled, but no Vo label. Which voltage are you supposed to solve for? Thanks.
Vo = Vb, labeled across the 40ohm resistor.

#### DaveE

Your equation looks good to me. The voltage at node Vc is negative because of the polarity of the dependent source, as labeled in the schematic.

"Voltage nodal analysis"

### Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving