With Respect To - Tutorial
wrt = with respect to
In the diagram, point A is 18 volts positive wrt to D. (this is actually the battery voltage).
Therefore D is 18 volts negative wrt A.
A is +12 wrt C and +6 wrt B.
D is - 6 wrt C and -12 wrt B.
B is +6 wrt C and +12 wrt D.
C is - 6 wrt B and -12 wrt A.
Looking at the diode. The anode is less negative than the cathode. Or in other words, it is more positive. The anode is positive wrt cathode by 1 volt.
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