According to Thevenin's theorem a two terminal power supply can be represented like this:
And According to Norton's theorem the same power supply can be represented like this:
From the Thevenin circuit we have
IL = VT/(Rint+RL)
From the Norton circuit we have
VAB = ISC(RintRL/(Rint+RL)) = ILRL ILRL = ISC(RintRL/(Rint+RL)) IL = VAB/RL = ISCRint/(Rint+RL)
VAB is the same for both circuits, so we can substitute what we stated IL was for the Thevenin circuit:
ISCRint/(Rint+RL) = VT/(Rint+RL) ISCRint = VT
Both theorems give us a way to represent complicated circuits as simpler ones, either as a simple series circuit, or a simple parallel circuit.
Fischer-Cripps. A.C., The Electronics Companion. Institute of Physics, 2005.
Copyright © 2014 Barry Watson. All rights reserved.