Think about what you have just said -- you don't believe that i0 can be zero, yet you have no problem proceeding with an approach that depends on it being zero. Does that sound like good, defensible engineering practice to you?Of course I didn't use the current in the upperside because it was 0.
Norton says that I can replace some resistors and sources for just 1 current source and 1 resistor.
OK, so now I apply Norton's theorem and the problem is solved.That's nice
What do you think about i0=0. I think that cannot be true, because I have a source and a resistor, so there has to be a current. Why do you say that i0 can be 0?
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