b) Draw the characteristic curve ($U = f(I)$) of this equivalent linear voltage source.
Remark: Independently from your solution in a.) use an open circuit voltage of 2 V and an internal resistance of 20 $\Omega$.
Result:
In the following the network is loaded with the resistor $R_L = 80 \, \Omega$
c) Draw the load characteristic in addition to the generator characteristic from the previous task in one and the same diagram.
Graphically determine the Operating Point.