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# Resistor Codes PowerPoint PPT Presentation

Resistor Codes. How to read the value of a resistor. 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. Resistance. 1. 4. 2. 3. The 4 bands.

Resistor Codes

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## Resistor Codes

How to read the value of a resistor

• 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

1

4

2

3

### The Fourth Band

• The last band is the tolerance

• This is how accurate the resistance is

• This has just two possible values

### Example

• Can you work out the value of the resistance?

• What is the value of each colour?

### Example

• Band 1 : Red =

• Band 2 : Black =

• Band 3 : Orange =

• Value ohms