Hi, I found this question from a textbook: Suppose there are two black boxes, Box A has a 1V voltage source and 1ohm resistance (Thevein Circuit); and Box B has a 1A current source and 1ohm resistance (Norton Circuit). You only have access to the two terminals. How do you know which is which by using only a shorting wire? When I look at the problem, I know that the Norton circuit is running with the terminals open, while the Thevenin one is not. Shorting the terminals of the Thevein circuit would make it start running, while shorting the terminals of the Norton circuit would not stop it running, but would greatly reduce the current through the 1ohm resistance. But how would I tell whether the circuit is running with just the wire? Perhaps the wire is not put between the two terminals? I look online and find an answer about how the Norton circuit would be hotter. But if that is the answer, why would I even need a shorting wire?