THEORY -4 REGISTER COLOR CODE CHART AND CALCULATIONS

Resistor Color Code

Object

1. To learn Resistor Color Code

2. To determine the stated value of a resistor by interpreting the color code indicated on the resistor.

Apparatus

1. Set of wires.

 2. Carbon Resistors.

 3. Digital A.V.O. meter.

Theory

There are two ways to find the resistance value of a resistor. The color bands on the body of the resistor tell how much resistance it has. As shown in the following diagrams figure (1), there are 5-band resistors and 4-band resistors. Form both 5- and 4-band resistors, the last band indicates tolerance in table (1). Consult with the “Resistor Tolerance” in table (2) chart for finding the tolerance value.

The first method for read resistor colors in Fig.(2)

Fig.(2) First method read resistor

The first litter word to represent color resistor code in table (1)

Table (2) Resistor Tolerance View the resistors and based on the color bands determine its value. Below is an example:

The first band is a one (1), the second band is a zero (0), and the multiplier band or third band is one time text to the third power ( ) or one thousand (1000). Multiply 10 times 1000. Another way to tell the resistance value of a resistor is to actually measure it with the ohmmeter. The explanation of how to measure the resistance is given in the later tip. Where:- Rmax = R+(R * T )

Procedure

 1. Measure and record twenty resistors with value of 1 Kohm. 

 2. Find the R max. , R min. then calculate the percentage error. 

 3. Repeat the steps (1,2) with resistor value of 10K ohm. 

 4. Repeat the steps (1,2) with resistor value of 100K ohm.

 Discussion

 1. Comment for your results.

 2. Determine the value and tolerance of the 10 resistors as shown in the following tables for chart fig. (3):