Kirchhoff s voltage law--KVL The algebraic sum of the voltage around any closed path in a circuit is zero. clokwise-0,+U=0 counterclockwise: D1-D2=0 KVL. ∑ U,=0orU1+U,+…+U 0 D clockwise: -D1 +02-U3=0 十 counterclockwise U-2+U3=0 十The algebraic sum of the voltage around any closed path in a circuit is zero. Kirchhoff' s voltage law--KVL A B + + − − 1  2 clokwise:−1 +2 = 0 counterclokwise :1 −2 = 0 0 2 0 1  = 1 + + + = = N N n KVL:  n or     +2 − + + − − 1   3 clokwise : −1 +2 −3 = 0 counterclokwise :1 −2 +3 = 0