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

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

3. The 4 bands

4. The values

5. What do the bands mean

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

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

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

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