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I'm working on some circuit Problems involving Thevenin's Theorem. When there is only one power source it seems pretty straight forward, but I'm a little confused when another power sources is added. Does it matter if a second power source is facing the opposite direction of the first?

I kind of understood the idea that you consider only one powersource at a time, but I just need some clarification. Thanks.

There is also a more challenging circuit problem (at least to me) in which a third powersource is added, this one is on a branch apart from the circuit which leads to the point A (a dead end). This is part of the system of points A,B for which the thevenin circuit is being constructed. Does this mean the Vab considering only this powersource is zero? thanks again, sorry if my description is confusing.

EDIT: should have put this in help with homework section, feel free to move it. I'd do it myself but I dont know how

I kind of understood the idea that you consider only one powersource at a time, but I just need some clarification. Thanks.

There is also a more challenging circuit problem (at least to me) in which a third powersource is added, this one is on a branch apart from the circuit which leads to the point A (a dead end). This is part of the system of points A,B for which the thevenin circuit is being constructed. Does this mean the Vab considering only this powersource is zero? thanks again, sorry if my description is confusing.

EDIT: should have put this in help with homework section, feel free to move it. I'd do it myself but I dont know how

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