Nace CP 1, Course Manual

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Basic Electricity 1:16
CP 1 – Cathodic Protection Tester Course Manual
©
NACE International, 2000
02/01/05
I
T
E
I
1
I
2
R
2
I
4
R
4
I
T
I
3
R
1
R
3
–
+
Figure 1.8 Series and Parallel Circuits Combined
Given
E = 20 V
R
1
= 5 Ω
R
2
= 4 Ω
R
3
= 2 Ω
R
4
= 0.95 Ω
First, reduce the parallel part of the circuit to a single resistance
using the same formula as shown for Figure 1.7:
Ω = =
Ω
+
Ω
+
Ω
=
05 . 1
95 . 0
1
2
1
4
1
5
1
1
R
T
We now have an equivalent series circuit of two resistors, 1.05
Ω
and 0.95
Ω
for a total resistance of 2.00
Ω
.