meaning of voltage drop

"SuperM" wrote in message news: snipped-for-privacy@4ax.com...

Quote: ">>If you add a resistor, the current changes- but wherever you measure it,

That is NOT Ohm's Law which is simply the linear relationship between voltage and current in an "ohmic" element.

Ohm's law has nothing to do with the fact that the current is the same everywhere in the loop. KCL does (even where Ohm's Law is meaningless).

That is all that I was trying to say.

I have no problem with use of Ohm's Law to determine the voltage drop across each element in the circuit -provided that they are linear and actually obey Ohm's Law (q.v).

If all the elements are ohmic, then linearity exists and you can go on, (using the far more basic Kirchoff's Laws) to develop the concept of series and parallel equivalents, Thevenin and all that nice stuff. Without linearity - all these things go out the window leaving Kirchoff's Laws and pain in the butt solutions.

Reply to
Don Kelly
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