color code

1. Resistor Color Coding

2. Overview
Review: What isaResistor?
Resistor ColorCodes
ResistorTolerance
Examples
Conclusion/ Review

3. Review: What isaResistor?
Resistors – circuit component thatresist (limits)
the flow of electrons in an electrical circuit.

4. Resistor ColorCodes
• Resistors have their resistance value and tolerance shown by
colored bands.
• Read the resistor bands from the left-hand side.
• 1st band is the one closest to one of the ends.
• 4th band will have either gold, silver, or no color.

5. Resistor ColorCodes
• 1st band =1st significant digit
• 2nd band =2nd significant digit
• 3rd band =multiplier
• 4th band =tolerance

6. Resistor ColorCodes
Bad
Boys
Raped
Our
Young
Girls
But
Violeta
Gave
Willingly

7. Resistor ColorCodes
Question: Why do we usecolor
codingin aresistor?
Ans.:For easier identification.

8. Resistor ColorCodes
1stband: orange 3
2nd band:white 9
3rd band: yellow 10,000
4th band: silver +/-1
0
%
Therefore:
39 x 10,000 =39,000
39 kilo ohms+/-1
0
%
1stband: red 2
2nd band:green 5
3rd band: black 1
4th band: silver +/-1
0
%
Therefore:
25x 1=39,000
25ohms+/- 1
0
%

9. GroupWork

10. Tolerance
From the resistorvalue:
39 kΩ+/- 1
0
%
The tolerance limits the
resistance to:
Minimum value:
39 kΩ-1
0
%=35.1kΩ
Maximum value:
39 kΩ+1
0
%=42.9 kΩ
From the resistorvalue:
25Ω+/- 1
0
%
The tolerance limitsthe
resistance to:
Minimum value:
25Ω-1
0
%=22.5 Ω
Maximum value:
25Ω+1
0
%=27.5 Ω

11. Tolerance
Question: Why doesaresistor
have tolerance?
Ans.:
There isno perfect resistor with
anexact value.
Resistors are manufactured in
approximate values.

12. Review &Conclusion
Review
• Calculate the resistance of thesample
resistors.
Conclusion
• Youcancalculate the resistance in a
resistor just byusingthe color bands.

13. ThankYou