Editing Network analysis (electrical circuits) (section)

===Source transformation===
[[Image:Sourcetransform.svg|thumb]]

A generator with an internal impedance (i.e. non-ideal generator) can be represented as either an ideal voltage generator or an ideal current generator plus the impedance.  These two forms are equivalent and the transformations are given below.  If the two networks are equivalent with respect to terminals ab, then {{mvar|V}} and {{mvar|I}} must be identical for both networks. Thus,

:<math>V_\mathrm{s} = RI_\mathrm{s}\,\!</math> or <math>I_\mathrm{s} = \frac{V_\mathrm{s}}{R}</math>
* [[Norton's theorem]] states that any two-terminal linear network can be reduced to an ideal current generator and a parallel impedance.
* [[Thévenin's theorem]] states that any two-terminal linear network can be reduced to an ideal voltage generator plus a series impedance.