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Question

The resistance value of a carbon resistor having red, violet, orange and gold colour band is

The correct answer is

27 kΩ ± 5%

CONCEPT:

  • Resistances are available in small as well as in large values.
  • The resistors are generally painted by a specific colour and a specific code is assigned to them. This is called colour coding of the resistance.
  • The resistance value, tolerance, and wattage rating are generally printed on the body of the resistor as numbers or letters.

Colour Coding of Resistance: To know the value of resistance colour code is used

  1. Colour band A and B: Indicate the first two significant figures of resistance in ohms.
  2. Band C: Indicates the decimal multiplier i.e. the number of zeros that follows the two significant figures.
  3. Band D: Indicates the tolerance in percentage about the indicated value or in other words, it represents the percentage accuracy of the indicated value.
  4. The tolerance in the case of gold is �5% and in silver is �10%. If only three bands are marked on carbon resistance, then it indicates a tolerance of 20%.
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