Electrical Circuit Analysis Set 1: Basic Concepts and Resistive Circuits Dr.Amnach Khawne Department of Computer Engineering,

Wires Wire are the most common form of conductive material used in electrical applications. Wire vary in diameter size and are arranged according to standard gauge number, called AWG (American Wire Gauge) size The larger the gauge number is, the smaller the wire diameter is.

Color-code bands on a resistor 1 st band is the first digit of the resistance value. 2 nd band is the second digit of the resistance value. 3 rd band is the multiplier (number of zeros). 4 th band indicates the tolerance.

Resistor color code

Precision Resistors Precision resistor values are identified with 5 color bands, the first 3 bands indicate resistance value, the 4 th band is the multiplier, and the 5 th band indicates the tolerance. Precision resistors will have a tolerance of 2%, 1%, 0.5%, 0.25% or 0.1%.