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Illustration Mesh (loop) rule - Wheatstone bridge example

Loop rule - 2nd Kirchhoff's second law
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Here you see a bridge circuit (Wheatstone bridge), in which three loops A, B and C have been drawn in as an example. With the help of the mesh rule you can calculate an unknown voltage between different resistors \(R_1\), \(R_2\), \(R_3\) and \(R_4\).