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Published on May 30, 2012
Online tutorial on creating a Thevenin Equivalent Circuit. In study of electric circuits, it is often desirable to determine the effect that a change in a single resistance will have on the currents and voltages of a circuit, while all other resistances remain unchanged. Although this type of problem may be solved by loop equations and determinants, the solution by Thevenin's theorem is an easier method. According to Thevenin's theorem, any two-terminal circuit, made up of fixed value resistances and of voltage and current sources, can be replaced by a single voltage source in series with a single resistance, which will produce the same effects at the terminals.
Steps shown in the video to create the Thevenin's equivalent circuit are as under, 1. Identify the portion of the network for which the Thevenin equivalent circuit is to be determined. 2. Label the two terminals A and B and remove the portion that is not to be included (i.e. the load) 3. Determine the Thevenin equivalent resistance, Rth, by short circuiting the voltage sources and open circuiting the current sources. 4. Calculate the resistance that appears between two open terminals previously labeled point A and B. 5. Now return all sources to their original state and position and determine the Thevenin voltage, Eth, which appears across the two terminals, A and B. 6. To complete the process draw the Thevenin equivalent circuit. Use the values of Eth and Rth obtained above. Place the removed portion of the circuit across the A and B terminals.
To further explain the process of creating a Thevenin equivalent circuit, the video shows an example of a simple network containing a single voltage source and resistors.
This tutorial demonstration is part of the online curriculum material from the Electronics Technician Certificate Programs, offered by George Brown College. Find out more about our distance education technical training programs at http://www.gbctechtraining.com.