**Source transformation** **- Voltage Source to Current Source or Current Source to Voltage Source**

An electrical source transformation is a method for simplifying circuits by replacing a voltage source with its equivalent current source, or vice versa.

According to the Thévenin and Norton theorems, any linear voltage source can also be viewed as a linear current source. Which circuit you use depends on which ideal form describes the behavior of your circuit in more detail.

__Voltage source ____<=>____ current source__

U_{out} = U_{s} – I * R_{s } <=> I_{Rout} = I_{S} – U_{out} / R_{s}

where R_{s} = U_{s} / I_{max} and I_{s} = V_{s} / R_{s}

Example: Source transformation - Voltage Source to Current Source and vice versa