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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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Presentation Transcript
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 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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