1. How to read the strength of a resistor
Resistance
How to read the strength of a resistor

2. Colour coding on resistors
Resistors are coated with ceramic.
They have colour coded bands to indicate the resistance strength!

3. Resistor  2 3 0 000 W 1st colour = 1st # 2nd colour = 2nd #
3rd
1st
   
Resistor 
1st colour = 1st #
2nd colour = 2nd #
3rd colour = # of zeros
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Gray 8
White 9 2 3
0 000 W

5. Resistor Tolerance The last band is gold or silver in colour.
They give the accuracy range.
The last example had silver  10%
Ω + 10 %
The resistor can be off by 10%
Digit 1 2 3 4 5 6 7 8 9
Colour
Black
Brown
Red
Orange
Yellow
Green
Blue
Violet
Grey
White
Gold
Silver
Tolerance
±5%
±10%

6. Violet, green, brown, gold 750 Ω + 5% 5% of 750 = 0.05 x 750 = 37.5 Ω
Digit 1 2 3 4 5 6 7 8 9
Colour
Black
Brown
Red
Orange
Yellow
Green
Blue
Violet
Grey
White
Gold
Silver
Tolerance
±5%
±10%
Put table here.
Violet, green, brown, gold
750 Ω + 5%
5% of 750 = 0.05 x 750 = 37.5 Ω
750 – 37.5 = = 787.5
Range = Ω – Ω
Please tape/glue table & write the following points into your notebook.

7. Activity to practice reading resistors
Get out a sheet of paper. 1per 2 students 
Write #1 to #10
Names at the top
Obtain a resistor board from the front.
Find the resistance & tolerance range for of the 10 resistors.
Hand-in when done.
Mark will be included in Competency 1.
Names:
Resistor #
Strength
Range
example
750 Ω + 5%
712.5 Ω Ω #1 #2 #3
...
Your paper should look like this.