Majas This article needs additional citations for verification. 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. 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. Views Read Edit View history.
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This page was last edited on 27 Decemberat The replacements of voltage and current sources do what the sources would do if their values were set to zero. The resistance is measured after replacing all voltage- and current-sources with their internal resistances. 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. The proof involves two steps. Articles with short description Articles needing additional references from November All articles needing additional references.
Original circuit The equivalent voltage The equivalent resistance The equivalent circuit. This article needs additional citations for verification.
Now, the uniqueness theorem guarantees that the result is general. 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. Theorem in thevwnin analysis. Resistance can then be calculated across the terminals using the formulae for series and parallel circuits. Unsourced material may be challenged and removed. The first step is to use superposition theorem to construct a solution.
The equivalent circuit is a voltage source with voltage V Th in series with a resistance R Th. From Wikipedia, the free encyclopedia. A zero valued current source passes zero current, regardless of the voltage across it; thevenn replacement, an open circuit, does the same thing. The theorem tgevenin applies to frequency domain AC circuits consisting of reactive and resistive impedances.
It is noted that the second step is usually implied in literature. 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. This method is valid only for circuits with independent sources. Please help improve this article by adding citations to reliable sources.
Views Read Edit View history. That means an ideal voltage source is replaced with a short circuit, and an ideal current source is replaced with an open circuit.
tp n° 4 : representation de thevenin et norton
Théorèmes de superposition, Thévenin et Norton