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BASIC ELECTRONICS‎  ‎DISCRETE COMPONENTS‎ 

RESISTOR

Resistor is used to restrict the amount of current in a circuit.The value of a resistor is called Resistance.  High resistance results in small flow of current. Low resistance results in higher flow of current. The unit of measure for Resistance  is Ohms. Resistors are used to protect other components from being damage by reducing excessive current in the circuit. Resistors are coded with coloured bands to show their value. Each colour stands for a number.  There are total 4 different bands on a resistor. The first three colour band shows the resistor value in Ohms. The fourth colour band shows the tolerance (accuracy) of the resistor. This is because resistor cannot be made accurately. It tells us in percentage  how close the resistor is to the coded value. The tolerance of the resistor is either within +/- 10% or +/-5%.  The smaller the percentage value, the more accurate the resistor is to the coded value. Decoding the colour band on the resistor Below is a table to help you decode the value on the resistor. Examples :  - Reading the resistor value from the table Measuring resistance with a Multimeter A Multimeter can be used to measure the resistance between two points in a circuit. The probe from the meter must be contact either side of the resistor. Twist the Multimeter dial to Resistance.