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Circuit

I am working on finding the equivalent norton and thevenin circuits. To fond the equivalent resistance, I zero out any sources. When this happens, according to my professor. Only the 10 ohm resistor to the left is short circuited as a result of the zeroing. Why is this the case? Why is the 12 ohm resistor not also short circuited by zeroing out any sources?

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Why is the 12 ohm resistor not also short circuited by zeroing out any sources?

When you zero out a current source, you make a 0 A current source. That is, an open circuit, not a short circuit.

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    \$\begingroup\$ So the rules is that zeroing a voltage source short circuits it but zeroing a current source sets current to 0. Or rather, zeroing a voltage source sets its voltage to 0 but current can still flow while zeroing a current source sets its current to 0. Seems I misunderstood zeroing. Thanks a lot Photon. \$\endgroup\$
    – user26358
    Commented Oct 11, 2015 at 3:18
  • \$\begingroup\$ yes, that's correct. \$\endgroup\$
    – The Photon
    Commented Oct 11, 2015 at 3:51

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