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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 thevejin follows. This method is valid only for circuits with independent sources. Please help improve this article by adding citations to reliable sources.

A zero valued voltage source would create a potential difference of zero volts between its terminals, theevnin of the current that passes through it; its replacement, a short circuit, does the same thing. Then, uniqueness theorem is employed to show that the obtained solution is unique.

This article needs additional citations for verification. Circuit theorems Linear electronic circuits. Theorem in circuit analysis.

Thévenin’s theorem – Wikipedia

Now, the uniqueness theorem guarantees that the result lo general. The first step is to use superposition theorem to construct a solution. This page was last edited on 27 Decemberat 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.

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In circuit theory terms, thevehin theorem allows any one-port network to be reduced to a single voltage source and a single impedance. 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.

By using this site, you ee to theveni Terms of Use and Privacy Policy. In other words, the above relation holds true independent of what the “black box” is plugged to. The resistance is measured after replacing all voltage- and current-sources with their internal resistances. The equivalent circuit is a voltage source with voltage V Th in series with a resistance R Th.

Unsourced material may be challenged and removed. The theorem also applies to frequency domain AC circuits consisting of reactive and resistive impedances. Resistance can then be calculated across the terminals using the formulae for series and parallel circuits.

Retrieved from thefenin https: Original circuit The equivalent voltage The equivalent resistance The equivalent circuit. A zero valued current source passes zero current, regardless of the voltage across it; its replacement, an open circuit, does the same thing.

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Thévenin’s theorem

Views Read Edit View history. From Wikipedia, the free encyclopedia. The proof involves two steps. It means the theorem applies for AC in an exactly same way to DC except that resistances are generalized to impedances. In other projects Wikimedia Commons. It is noted that the second step is usually implied in literature.

That means an ideal voltage source is theveenin with a short circuit, and an ideal current source is replaced with an open circuit.

The replacements of voltage and current sources do what the sources would do if their values were set to zero. November Learn how and when to remove this template message. Articles with short description Articles needing additional references from November All articles needing additional references.