Friday, 30 December 2016

Opposing Ideal Current Sources


So I'm looking at the circuit below and a little confused by it.


Opposing Ideal Current Sources


How are there two current sources facing opposite directions? What does this even mean and how can it be a valid circuit, since current can only travel one direction?




Answer



\$v_x\$ can be negative, and in fact it is. Even if it wasn't, \$\alpha\$ could be negative.


Regardless of the fact the question is answerable, it's a nonsense question and applies to no situation I can imagine in real-world engineering. I suggest you give your instructor the answer they want and the forget you ever saw this question.


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