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When a short-circuit exists, how to find the current?

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Homework Statement
Find the Norton equivalent circuit of the circuit in Fig 4.45 at terminals a-b
Homework Equations
When a short-circuit exists, current of other resistances with parallel is 0
4.12.JPG


I am not an English speaker, I apologize that I cannot use English well.

I have a question calculating the IN. When the terminal a-b is short-circuited, is it right that the currents are zero at 2 ohm and 6 ohm resistances?(Because they are parallel with a short-circuit.)

Also, because the current is zero at 2 ohm resistance, the Vx is zero. Is it right?
 

BvU

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I can't think of any counter-arguments, so: yes, I think so !
 
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I can't think of any counter-arguments, so: yes, I think so !
Thank you for your answer!!!
 

jbriggs444

Science Advisor
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Also, because the current is zero at 2 ohm resistance, the Vx is zero. Is it right?
I would reason the other way around. If terminal a is shorted to terminal b then this forces the potentials at a and b to be equal. So ##V_x## is zero. It then follows that the current across the 2 ohm resistance is zero.
 
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I would reason the other way around. If terminal a is shorted to terminal b then this forces the potentials at a and b to be equal. So ##V_x## is zero. It then follows that the current across the 2 ohm resistance is zero.
wow I understand it thank you!!
 
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