voltage source, which represents a rise in potential
from point a to point b. Next, in moving from point b to point c, we pass
through resistor R1, which presents a potential drop of V1. Continuing
through resistors R2 and R3, we have additional drops of V2 and V3 respectively.
By applying Kirchhoff’s voltage law around the closed loop, we
arrive at the following mathematical statement for the given circuit: