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Unformatted text preview: he Thevenin voltage will be zero. (Understand this by applying the Superposition principle.) Again, looking at the Thevenin’s equivalent circuit, if the two terminals of the circuit are shorted, then the current flowing in the circuit will be the short circuit current equal to I sc VT
V RT T . RT
I sc Using this, we can find the Thevenin resistance for a circuit by knowing its short circuit current Isc . 48 EE1002 Introduction to Circuits and Systems So to obtain the Thevenin equivalent for a given two‐terminal circuit, we first obtain the open circuit voltage and the short circuit current, using circuit analysis methods like node voltage analysis or mesh current analysis. From these, we obtain the voltage and the resistance of the Thevenin’s equivalent circuit. Finding the Thevenin’s resistance RT If there are only independent sources in the circuit, then RT can be found be killing all the sources (short the terminals of an independent voltage source and open the end of an independent current source) and doing series parallel manipulations to find the equivalent resistance. If there...
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This document was uploaded on 01/20/2014.
- Winter '14