Question
Download Solution PDFIn a resistor, the first three bands from left to right have colours Yellow, Purple and Red then, what will be the value of resistor in ohm?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
The below equation shows the method to find the resistance:
The value of the resistance is given in the form:
R = AB × C ± D%
Where,
‘A’ and ‘B’ indicate the first two significant resistance figures (Ohms).
‘C’ indicates the decimal multiplies.
‘D’ indicates the tolerance in percentage.
The table for the resistor color code is given below:
|
Colour code |
Values (AB) |
Multiplier (C) |
Tolerance (D) |
|
Black |
0 |
100 |
|
|
Brown |
1 |
101 |
|
|
Red |
2 |
102 |
|
|
Orange |
3 |
103 |
|
|
Yellow |
4 |
104 |
|
|
Green |
5 |
105 |
|
|
Blue |
6 |
106 |
|
|
Violet |
7 |
107 |
|
|
Grey |
8 |
108 |
|
|
White |
9 |
109 |
|
|
Gold |
- |
- |
± 5 % |
|
Silver |
- |
- |
± 10 % |
|
No color |
- |
- |
± 20 % |
Calculation
The resistor color code uses the following values for the first three bands:
Yellow → 4 (1st significant digit)
Purple (Violet) → 7 (2nd significant digit)
Red → 102 = 100 (Multiplier)
Resistance = (First Digit × 10 + Second Digit) × Multiplier
Resistance = (4×10+7)×100 = 4700 Ω
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