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E245 L
Experiment 4
October 11, 2007
Experiment 4
Thevenin Equivalent Circuits
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View Full Document Objective:
The objective of this lab is to learn how to obtain a Thevenin Equivalent
circuit by making measurements of the IV (currentvoltage) characteristics at a pair of
terminals. This is done by building two technically arbitrary circuits and taking
measurements of both the current and voltage characteristics at a pair of terminals.
Specifically using 5 resistors a 500ohm, 1kohm, 1.5kohm, 2kohm, 2.5kohm; this is in
addition to one variable resistor.
The Thevenin equivalent resistance R
Th
can be determined from the equation:
Diagrams:
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View Full Document Calculations:
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View Full Document Analysis of Results
As can be seen from the data collected, the predicted values for the Thevenin
circuit approximately matched the actual values of the Thevenin circuit that was built for
both parts of the experiment. Given the two different circuits that were built, the open
circuit voltages between terminals a and b were first determined. The short circuit
currents between a and b were also obtained. After the i
sc
and the v
oc
were found, R
th
could easily be calculated using Ohm’s law. In order to test if the calculated value for R
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This note was uploaded on 04/02/2008 for the course E 245 taught by Professor Tang during the Spring '08 term at Stevens.
 Spring '08
 Tang
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