21.4 Series and Parallel Combinations of Resistances
The Series Combination
Click here to enlarge
From Kirchoff's First Law, also known as KCL ( Kirchoff's Current law), it is obvious that the
current i flowing through each resistance is the same.
From Kirchoff's Second Law, also known as KVL (Kirchoff's Voltage Law).
At junction Q (- i ) + (+ i1) +
(+ i2) + ( i3) = 0 by KCL.
\ i = i1 + i2 + i3
Around the loop PQLORSP
VPQ + VQL +
VOR + VLO +
VRS + VSP = 0
0 + 0 + (-i1
R1 ) + 0 + 0 + E = 0
(The potential difference across connecting wires is taken as zero)