# Source Transformation Source transformation is a method of simplifying a circuit with mixed sources using [[Thevenin's and Norton's Theorem|Thevenin's and Norton's theorems]]. Thus, source transformation is only valid for [[Linear Circuit|linear circuits]]. Note the similarity of the expressions with [[Ohm's law]]. ![[SourceTransformation.svg]] $\mathbf{V}_{\text{S}}=\mathbf{I}_{\text{S}}\mathbf{Z}\Longleftrightarrow\mathbf{I}_{\text{S}}=\frac{\mathbf{V}_{\text{S}}}{\mathbf{Z}}$