Question

Explain the practice of colour coding the
resistance value on a resistor.​

Answer 1

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A resistor is a device which offers resistance to the flow of electric current through it. An electronic circuit contains many resistors having different resistances. Most of these are carbon film resistors that can be manufactured inexpensively on a large scale. Because of the mass-production of these resistors and especially their small size, it is not possible to print the resistance value in numerals on the body of the resistor. Hence, a standard colour code has been adopted to indicate the resistance value.

Three or four coloured rings are marked on the cylindrical body of a resistor. Three rings which indicate the resistance value are close to one end, so that the ring closest to the end is considered the first ring. Then, the colours of the first two rings indicate the first and second digits in the value of the resistance. The colour of the third ring denotes the power of 10.

A fourth ring, if present, is visibly farther from one end of the resistor than the first ringnfrom the other end. The colour of the fourth ring denotes the tolerance in percentage, the maximum amount by which the actual resistance might be different from the marked value and still be acceptable.

Answer 2

Answer:

Components and wires are coded with colors to identify their value and function. Resistor Color Coding uses colored bands to quickly identify a resistors resistive value and its percentage of tolerance with the physical size of the resistor indicating its wattage rating.

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