LOI DE THEVENIN PDF
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In other projects Wikimedia Commons. Please help improve this article by adding citations to reliable sources. The theveninn step is to use superposition theorem to construct a solution.
From Wikipedia, the free encyclopedia.
The equivalent circuit is a voltage source with voltage V Th in series with a thevenon R Th. Then, uniqueness theorem is employed to show that the obtained solution is unique. Views Read Edit View history. Theorem in circuit analysis. It is noted that the second step is usually implied in literature.
Now, the uniqueness theorem guarantees that the result is general. 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. 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.
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. This method is valid only for circuits with independent sources. By using superposition of specific configurations, it can be shown that for thevenon linear “black box” circuit which contains voltage sources and resistors, its voltage is a linear function of the corresponding current as follows.
The resistance is measured after replacing all voltage- and current-sources with their internal resistances. Resistance can then be calculated across the terminals using the formulae for series and parallel circuits.
The proof involves two steps. This page was last edited on 27 Decemberat A zero valued current source passes zero current, regardless of the voltage across it; its replacement, an open circuit, does the same thing.
November Learn how and when to remove this template message. In circuit theory terms, the theorem allows any one-port network to be reduced to a single voltage source and a single impedance.
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, regardless of the current that passes through it; its replacement, a short circuit, does the same thing. Original circuit The equivalent voltage The equivalent resistance The equivalent circuit.
The theorem also applies to frequency domain AC circuits thevenln of reactive and resistive impedances. This article needs additional citations for verification.
Thévenin’s theorem – Wikipedia
In other words, the above relation holds true independent of what the “black box” is plugged to. It means the theorem applies for AC in an exactly same way to DC except that resistances are generalized to impedances. That means an ideal voltage source is replaced with a short circuit, and an ideal current source thevsnin replaced with an open circuit.