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. Resistance. 1. 4. 2. 3. The 4 bands.

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Resistor Codes

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Resistor codes

Resistor Codes

How to read the value of a resistor


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

Resistance


The 4 bands

1

4

2

3

The 4 bands


The values

The values


What do the bands mean

What do the bands mean


The fourth band

The Fourth Band

  • The last band is the tolerance

  • This is how accurate the resistance is

  • This has just two possible values


Example

Example

  • Can you work out the value of the resistance?

  • What is the value of each colour?


Example1

Example

  • Band 1 : Red =

  • Band 2 : Black =

  • Band 3 : Orange =

  • Value ohms


Answer

Answer

  • Band 1 : Red = 2

  • Band 2 : Black = 0

  • Band 3 : Orange = 3 zeros : 000

  • Value 20,000 ohms


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