# Two electrical Problems I'm stuck on

• Oblio
In summary, the conversation is discussing how to start a task involving circuit pictures. The questions being referred to are numbers 18 and 24, which can be found in a provided link. The first question involves finding the equivalent resistance when voltage sources are removed, as well as the open circuit voltage across terminals with a specific source removed. The second question suggests using nodal analysis to express Vnodal in terms of V3.
Oblio
hey guys, I'm not sure how to start these off. Can someone give me a hint?

I'm not sure how else to show these (they have circuit pictures). The questions are numbers 18 & 24 here http://www.physics.brocku.ca/Courses/2P31/DH-Asst1.pdf .

Last edited by a moderator:
For 18... you know that Vth = Rthv * i_sc. If you remove V, find the equivalent resistance (what do you do with voltage sources? current sources? open or short which one?). Also find the open circuit voltage across your terminals with V2 removed. I'm pretty sure this is what you would do.

For 24, use nodal analysis. That'll give you an expression of Vnodal as a function of V3.

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