thevenin and norton equivalent circuits - jack ou · thevenin resistance steps: 1.replace all...
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Thevenin and Norton Equivalent Circuits
Jack Ou
Department of Electrical and Computer Engineering
Sec. 5.4-Sec. 5.5
Basic Idea
Note that voc = iscRt .
Open Circuit Voltage (voc)
1. Remove the load
2. Determine the open circuit voltage
Example
Determine voc .
Short Circuit Current
1. Remove the load
2. Short a and b
3. Calculate isc
Example
Determine isc .
Thevenin Resistance
Steps:
1. Replace all independent voltage sources with shorts
2. Replace all independent current sources with opens
3. Two possibilitiesI Only resistors are left: find the Thevenin resistance by merging
the resistors.I Else, apply either a test voltage or a test current to find the
Thevenin resistance.
Note: In step 1 and 2, dependent current and voltage sources arenot replaced with open circuits or short circuits.
Example 1
Example 2: Find Rt by Merging Resistors
Example 3: Use a test source to find Rt
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