In order to find R thevenin, I need to find Isc across a and b since there's a dependent source. Based on my calculations, Vth=500/3V. I've spent countless hours thinking about Isc,please help.

  • 1
    \$\begingroup\$ Please show all of your work so far. -1 for taking a poor photo and not cropping. \$\endgroup\$ – Elliot Alderson Jan 2 at 12:50
  • \$\begingroup\$ indeed,that was poor from my part,I will use circuit lab. \$\endgroup\$ – doom Jan 2 at 13:05

First of all, I strongly recommend actually assigning names (like \$R_1\ldots R_4\$) to your resistors. It makes talking about schematics much easier.

Anyway, when shorting a-b, your 10 Ω becomes irrelevant.

All the current from the current source goes through that short, so while we have to add that current to the total current through the a-b short in the end, it doesn't interfere with the rest of the calculation. So, you build a "helper" circuit.

Thus, all you have to do is calculate the current through R3 in this circuit:


simulate this circuit – Schematic created using CircuitLab

The voltage across R2 (or across R3) is your v_x; I'm sure you can solve this :)


Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Not the answer you're looking for? Browse other questions tagged or ask your own question.