To Measure Resistance using Color Band By: Engr.Irshad Rahim Memon

 Calculate the resistance value by 4-band color coding (Fixed resistor)  Calculate the resistance value by 5-band color coding (Fixed resistor)  Measure the resistance by using “Multi meter”

 A component that is specifically designed to have a certain amount of resistance is called a resistor. The principal applications of resistors are to limit current in a circuit, to divide voltage, and, in certain cases, to generate heat.  Although resistors come in many shapes and sizes, they can all be placed in one of two main categories: fixed and variable.  The electronic color code is used to indicate the values or ratings of electronic components, very commonly for resistors, but also for capacitors, inductors, and others.

 Color-coding of this form is becoming rarer. In newer equipment, most passive components come in surface mount packages  Many of these packages are unlabeled, and those that are labeled normally use alphanumeric codes, not colors.  In one popular marking method, the manufacturer prints 3 digits on components: 2 value digits followed by the power of ten multiplier

 Thus the value of a resistor marked 472 is 4,700 Ω, a capacitor marked 104 is 100 nF (10x104 pF), and an inductor marked 475 is 4.7 H (4,700,000 µH)  This can be confusing; a resistor marked 270 might seem to be a 270 Ω unit, when the value is actually 27 Ω (27×100).

 4-bands Color coding Table:

 The first band is the first digit of the resistance value.  The second band is the second digit of the resistance value.  The third band is the number of zeros following the second digit, or the multiplier.  The fourth band indicates the percent tolerance and is usually gold or silver.

 First band-1st digit  Second band-2nd digit  Third band-3rd digit  Fourth band-multiplier  Fifth band-tolerance

 Color Band of 4-band,5-band and 6-band resistors have been verified and observed