Nace CP 1 - Page 51

Basic Electricity 1:28
CP 1 – Cathodic Protection Tester Course Manual
© NACE International, 2000
02/01/05
Exercise 1.3: Parallel Circuit
Given:
Power supply voltage (E) = 20 V
Load resistance (R
1
) = 1 
Load resistance (R
2
) = 2 
Current across load resistance (R
3
) = 20 A
What is the total power voltage? _____________________
What is the voltage drop across R
1
? __________________
Calculate current through R
1
? ____________________
What is the voltage drop across R
2
? ___________________
Calculate current through R
2
? ____________________
What is the voltage drop across R
3
? ___________________
Calculate the resistance of R
3
? _______________________
Calculate total current? ____________________________
Calculate total resistance using Ohm’s Law?
________________________
Calculate total resistance using the parallel circuit total resistance
equation?____________________________
Using arrows, show the application of Kirchhoff’s Current Law.
E
I
I
1
I
2
I
3
I
R
1
R
2
R
3