Basic Electronics Engineering I : Resistors ,Resistor Color Code

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Basic Electronics Engineering I

:: Resistors

Schematic Symbol

Film Resistor

Fixed Resistor

Resistors are components specially designed to have a certain amount of resistance. The main applications of resistors are to reduce current or to divide voltage. Resistors can be either fixed or variable in value.

A fixed resistor has a resistance value that doesn't change. The most common type of fixed resistors includes carbon-composition, carbon-film, metal-film, wire-wound and surface mount chip resistors. The figure shows the shape and/or cross-section of several common types of resistors

:: Resistor Color Code

Fixed resistors are color-coded to indicate their resistance value in ohms. The four-band color-code system is shown in figure.

The first three bands indicate the resistance value. It is calculated with two digits and a decimal multiplier, which gives the number of zeros after the two digits. The fourth band indicates the percent tolerance. A gold or silver third stripe indicates a fractional multiplier. Color codes for numerical values are listed in the table.

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