Quote of the Day  Question of the Day
Source Substitution
Review of Mesh and Nodal Analysis
Mixed Source Example
solved by Mesh Analysis and by
Nodal Analysis
Thévenin'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 Thévenin Approach
Concept Check: Thévenin'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/05.html"
Last updated Sept. 13, 1999.
Copyright George Watson, Univ. of Delaware, 1999.