Basic Electricity 1:26
CP 1 – Cathodic Protection Tester Course Manual
© NACE International, 2000
02/01/05
Exercise 1.1: Ohm’s Law
Write the 3 forms of Ohm’s Law here
E =
I =
R =
Given:
A light bulb is designed for 120 V and has a resistance of 20 .
How much current will flow through it? _______________
How many watts will it take (P = V x I)? _______________
Given:
A corrosion circuit produces 2 A of current at a driving voltage of
1.6 V.
What is the resistance of this circuit? __________________
Given:
A structure requires 100 mA for adequate cathodic protection and
the total resistance is 1.5 .
What is the required voltage for this circuit? ____________
Given:
The driving voltage between the anodes and the structure of a
cathodic protection system is 1 volt and the protective current is
100 mA..
What is the circuit resistance? _______________________
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