RESISTORS AND THERE COLOR CODING

 A resistor is a passive two terminal electronic component that is used to reduce the flow of current in a circuit.

All resistors have their power ratings, which is the maximum power a resistor can dissipate without damaging the resistor.

 Therefore a 1watt resistor with a resistance of 100ohms can pass a current of a current of 100miliAmpere whereas a resistor of 0.25watts of the same resistance could only pass a current of 50mA, if the current level where exceeded in either case for any length of time, will cause the resistor to overheat and burnout . There are different types of resistor which is shown below.

TYPES OF RESISTOR

        I.            FIXED RESISTORS : These are resistors with fixed value, which means that there value cannot be varied

Fixed Resistor Symbol

      II.            VARIABLE RESISTORS: These are resistors that has a variable point where you can change the resistance of the resistor from minimum to maximum. below shows resistor color code

Variable Resistor Symbol

RESISTOR COLOR CODING

Common resistors found in different electronic circuit are marked with different color in their body, this is done because of the small size of the resistors and their values are difficult to print on their body.

The first colour on the body of a resistor indicates its first digit as shown in the table above while the second colour indicates its second digit, the super script in the 3^rd band indicates the number zeros to be added to the first and second band in other to obtain the resistors value. The tolerance value shows the minimum and maximum range of value for any given resistor.

Finding a resistor value with its color code> example  A resistor with the following color code RED,RED,BROWN and SILVER will have the value 220 + or – 10percent which means the value of the resistor will fall between 220+22 and 220-22 that is within the range of 198ohms and 242ohms.

LETTER CODE OF A RESISTOR AND ITS MEANING

Letter code is used in some resistors to represent their value due to the body structure where color code cannot be printed on them, the table below shows a clear picture of resistor value representation.

 

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