[![Schematic showing two diodes across two voltage rails][1]][1]


  [1]: https://i.sstatic.net/jlzdv.png

I want to find \$I\$, \$I_{D2}\$ and \$V\$ in this circuit. The diodes are made of Silicium. I'm a beginner and normally I would assume the Diode bias and then apply KVL to see if it is true. However, I've only encountered circuits where the wire forms a loop. 


 1. How am I supposed to apply KVL in this case?


 2. If voltage is the difference in potential between two points, how can I find the voltage of V if one point is outside of the circuit, therefore, outside of KVL application?