Quote of the Day  Question of the Day
Source Substitution
Review of Mesh and Nodal Analysis
Thevenin's Theorem
Any twoterminal linear circuit can be replaced with a voltage source
in series with a resistance which will produce the same effects at the terminals.
V_{Th} is the opencircuit voltage V_{oc} between the two terminals of the circuit that the Thevenin generator is replacing.
R_{Th} is the ratio of V_{oc} to the shortcircuit current I_{sc}. 
Detailed Example of Thevenin Approach
Concept Check: Thevenin's Theorem
Norton's Theorem
Any twoterminal linear circuit can be replaced with a current source
in parallel with a resistance which will produce the same effects at the terminals.
I_{N} is the shortcircuit current I_{sc} of the circuit that the Norton generator is replacing.
Again, R_{N} is the ratio of V_{oc} to the shortcircuit current I_{sc}.

Detailed Example of Norton Approach
Concept Check: Norton's Theorem
"http://www.physics.udel.edu/~watson/phys345/class/5.html"
Last updated Sept. 15, 1998.
Copyright George Watson, Univ. of Delaware, 1998.