1. How to read the value of a resistor
Resistor Codes
How to read the value of a resistor

2. Resistance Resistance is measure in Ohms The symbol for ohms is 
To find the resistance of a carbon resistor we must be able to read the resistor code
On each resistor there are 4 coloured bands

3. The 4 bands 1 3 4 2

4. The values

5. What do the bands mean

6. The Fourth Band The last band is the tolerance
This is how accurate the resistance is
This has just two possible values

7. Example Can you work out the value of the resistance?
What is the value of each colour?

8. Example
Band 1 : Red =
Band 2 : Black =
Band 3 : Orange =
Value ohms

9. Answer Band 1 : Red = 2 Band 2 : Black = 0
Band 3 : Orange = 3 zeros : 000
Value 20,000 ohms