PART A
SERIES CIRCUITS CONNECTED IN PARALLEL
A series-parallel circuit may consist of series circuits connected in
parallel or it may consist of parallel circuits connected in series.
You have had the necessary laws and formulas needed to solve series-
parallel circuit problems. The important thing to remember is that
when working with resistances connected in series, use series-circuit
laws; and when working with resistances connected in parallel, use
parallel-circuit laws.
The following formulas are based on the laws of series circuits.
Total resistance equals the sum of the individual resistances.
Rt = R1 + R2 + R3 ....
Current flow is the same across
each resistance.
It = I1 = I2 = I3 ....
Total voltage equals the sum of the
voltage drops across each resistance.
Et = E1 + E2 + E3 ....
The following formulas are based on the laws of parallel
circuits.
Total resistance is determined by the reciprocal method.
1
=
1
+
1
+
1 ....
Rt
R1
R2
R3
Total current is equal to the
sum of the current of each
branch.
It = I1, + I2 + I3 ....
Total voltage is equal to the
voltage of each branch.
Et - E1 = E2 = E3 ....
IT0334
2-2
Previous Page
