Each set below lists potential differences (in volts) encountered by a charge during one clockwise traversal of a single closed loop.
I. (+5,−2,−3)
II. (+10,−4,−4,−4)
III. (+9,−4,−2)
IV. (+6,−3,−3,−1)
Identify which set(s) are consistent with energy conservation for the loop and briefly justify your selection.