1 FUNDAMENTALS OF ELECTRICITY
BASIC ELECTRICITY FOR
TECHNOLOGY PROGRAMS
Tim Schneider, A.Sc.T.
Instructor, Electronics Systems Engineering Technology
School of Mining, Energy, and Manufacturing
Saskatchewan Polytechnic
Fundamentals of Electricity by Tim Schneider, A.Sc.T is licensed under a Creative
Commons Attribution 4.0 International License, except where otherwise noted.
All images were taken at Saskatchewan Polytechnic unless otherwise noted. All figures and tables were created at Saskatchewan Polytechnic unless otherwise noted.
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LAB 1: MEASURING RESISTANCE
Objectives:
Work safely on electrical equipment
Observe concepts of resistance, continuity, conductors, and insulators
Measure resistance with a multimeter.
Materials:
Multimeter with probes
Copper wire spools:
wet sponge
14 AWG 300 meters
wood
16 AWG 300 meters
20 AWG 300 meters
22 AWG 75 meters
22 AWG 1500 meters
Information:
In this lab we will measure the resistance of common equipment using a hand-held multimeter.
When the resistance you are measuring is greater than 32MΩ (32,000,000 ohms), the Fluke 70 will display O.L (over limit).
You must ensure to apply the proper amount of pressure on the probe tips when you are making a resistance measurement. If the probes are just resting there will not be a good connection and the meter will not read the correct resistance.
2 ) S e t m e t e r d i a l t o Ω .
4 ) W h a t d o e s t h i s m e t e r
r e a d i n g m e a n ?
Practice reading the resistance colour code.
2.
Measure resistance using a digital multimeter.
3.
Study the operation of a variable resistor.
Information:
Band 1
Band 2
Band 3
Band 4 (Tolerance)
(Multiplier)
Table 2-1: Resistor Colour Chart
Resistors
Significant Figures
Colour
Multiplier
Tolerance, ± %
1 or 100
–
0
Black
10 or 101
–
1
Brown
100 or 102
–
2
Red
1,000 or 103
–
3
Orange
10,000 or 104
–
4
Yellow
100,000 or 105
–
5
Green
106
–
6
Blue
107
–
7
Violet
108
–
8
Gray
109
–
9
White
0.10 or 10-1
5
–
Gold
0.01 or 10-2
10
–
Silver
–
20
–
No Color
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Materials:
1 – Digital Multimeter
6 – Assorted Resistors (All different values)
1 – 1.0 kΩ or 5.0 kΩ Potentiometer
Breadboard and connecting leads
References:
Class Notes
Procedure:
A.
FIXED RESISTOR
1.
Place resistors neatly on your breadboard.
2.
Determine the rated value of each resistor from the colour code and record the information in the following table.
Resistor Colour and Value
Measured
Resistor No.
Value
1st Colour
2nd Colour
3rd Colour
4th Colour
Rated Value
Tolerance
1
2
3
4
5
6
3.
Measure the resistance of each individual resistor and record in the table.
NOTE: Be sure you are not touching the metal parts of the probe when you are taking your resistance readings as this may give you a false indication.
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B.
VARIABLE RESISTORS
1.
Obtain a potentiometer.
a. Place the variable resistor on the breadboard so that the three prongs leading from it are in the same position as indicated in Figure 2-2.
A
C
B
Figure 2-2: Variable Resistor
2.
Tur