GG102 Lecture Notes - Lecture 2: Surface Mining

In Cutnel, Johnson's 8th ed. problem 85 in chapter 20,following the path BCDAB illustrates a path "with" the current fromC to D. In an example from my lecture class it is shown that a pathdirected with the current that crosses a voltage drop isillustrated as a negative value. This is in contrast to what isshown in problem 85. It is shown as a positive value; (+2.0V). Thisconflict of like scenarios makes it difficult for me to understand.What am I misinterpreting?