Question:
A carbon resistor has a tolerance of 20\%. As per the colour codes of resistors, the last band in that resistor is
A carbon resistor has a tolerance of 20\%. As per the colour codes of resistors, the last band in that resistor is
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When you see no colour band on a resistor, the tolerance is 20\%. For other common tolerance values, gold corresponds to 5\% and silver to 10\%.
Updated On: Apr 30, 2025
- silver
- absent
- red
- gold
- blue
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The Correct Option is B
Solution and Explanation
In the colour code for carbon resistors, the first three bands represent the digits of the resistor value, and the fourth band represents the tolerance. For carbon resistors:
- A tolerance of 20\% corresponds to no colour band (or absent).
- A gold band indicates a tolerance of 5%.
- A silver band indicates a tolerance of 10\%.
Thus, for a resistor with a tolerance of 20\%, the last band would be absent.
Hence, the correct answer is (B) absent.
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