Can anyone tell me the current flow and which supply is sinking and which supply is sourcing in the following configuration
A 20 volt supply connected to a isolated DC to DC converter the + of the DC to DC converter connected to GND giving a -20 volt output on the - of the DC to DC converter output if you then connect a resistive load across the 20 volt supply and the -20 volt from the dv to DC converter which supply is sourcing and which supply is sinking and what direction is the current flowing

 

No current will flow as its an Isolated supply!!