[Herald1360]

Well it works in a simulation, at least. In the attached circuit, the current through the resistor is zero and the voltage across it ditto. The current through the 10R is exactly 500mA as would be expected from a 5V source fed via zero R to a 10R load.


You can think of the current source in parallel with the 100m as being equivalent to another voltage source with an internal resistance of 100m connected in series between the 5V supply and its 10R load if you like.