- #1
Toyona10
- 31
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Homework Statement
Greetings to all,
I can't work the Vth out (across terminals a and b) from the circuit in the image I've attached here.
There was a hint in the question too:' ... Define the voltage at the left most node as 'v', and write 2 nodal equations with Vth as the right node voltage'. The answer for Vth given in the book is 30V.
Homework Equations
The Attempt at a Solution
I've tried according to the hint given but my answer didn't match. Maybe there is a mistake with my nodal equations...? This is what I came up with:
For node a: 'v'= ir= 60*4= 240V
For node b: Vth/80 + Vth/40...= 0 --------> (1)
and Vth/40 = i delta ----->(2)
Yeah I know that in the 1st equation I didnt include a term for the 20Ω resistor as I'm not sure about how to because of the dependent voltage source in between (and when I somehow did, I got weird answers :S). So, I'd appreciate it very much if anyone would kindly show me the correct set of nodal equations I need to construct to get the correct answer for Vth.
Thank you c: