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Views Read Edit View history. It means the theorem applies for AC in an exactly same way to DC except that resistances are generalized to impedances.

The equivalent circuit is a voltage source with voltage V Th in series with a resistance R Th. From Wikipedia, the free encyclopedia. Thevnein is noted that the second step is usually implied in literature. Articles with short description Articles needing additional references from November All articles needing additional references. A zero valued voltage source would create a potential difference of zero volts between its terminals, fhevenin of the current that passes through it; its replacement, a short circuit, does the same thing.

Retrieved from ” https: Circuit theorems Linear electronic circuits. The resistance is measured after replacing all voltage- and current-sources with their internal resistances.

A zero valued current source passes zero current, regardless of the voltage across it; its replacement, an open circuit, does the same thing. That means an ideal voltage source is replaced with a short circuit, and an ideal current source is replaced with an open circuit.


In other words, the above relation holds true independent of what the “black box” is plugged to. Please help improve this article by adding citations to reliable sources. In circuit theory terms, the theorem allows any one-port network to be reduced to a single thevrnin source and a single impedance.

By using superposition of specific configurations, it can be shown that for any linear “black box” circuit which contains voltage sources and resistors, its voltage is a linear function of the corresponding current as follows. Theorem in circuit analysis. In other projects Wikimedia Commons.

Thévenin’s theorem

The first step is to use superposition theorem to construct a solution. The theorem also applies to frequency domain AC circuits consisting of reactive and resistive impedances.

This method is valid only for circuits with independent sources. The proof involves two steps.

The replacements of voltage and current sources do what the sources would do if their values were set to zero. Unsourced material may be challenged and removed.


Original circuit The equivalent voltage The equivalent resistance The equivalent circuit. Now, the uniqueness theorem guarantees that the result is general. Then, uniqueness theorem is employed to show that the obtained solution is unique.

Here, the first term reflects the linear summation of contributions from each voltage source, while the second term measures the contributions from all the resistors.

Thévenin’s theorem – Wikipedia

Resistance can then be calculated across the terminals using the formulae for series and parallel circuits. This article needs additional citations for verification. This page was last edited on 27 Decemberat By using this site, you agree thevwnin the Terms of Use and Privacy Policy. If there are dependent sources in the circuit, another method must be used such as connecting a test source across A and B and calculating the voltage across or current through the test source.

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