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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
Uout = Us – I * Rs <=> IRout = IS – Uout / Rs
where Rs = Us / Imax and Is = Vs / Rs
Example: Source transformation - Voltage Source to Current Source and vice versa