RESISTOR COLOR CODING (Part 1)

So this is my own version of giving you information about RESISTOR COLOR CODING. Some information came from other sites. (as stated)

RESISTOR

-        A device that resists current to be able to obtain a safe value.

Two types of resistor:

Fixed Resistor

a.     Lead arrangements
b.    Carbon composition
c.     Carbon pile
d.     Carbon film
e.     Printed carbon resistor
f.      Thick and thin film
g.     Metal film
h.     Metal oxide film
i.       Wire wound
j.       Foil resistor
k.     Ammeter shunts
l.       Grid resistor
m.   Special varieties

Variable Resistor

      a. Adjustable Resistor
      b. Potentiometer
      c. Resistance decade boxes
      d. Special devices

What is a Carbon Composition Resistor?

Carbon composition resistors consist of a solid cylindrical resistive element with embedded wire leads or metal end caps to which the lead wires are attached. (www.wikipedia.com)

A carbon composition resistor has 4 sets of bands namely: 3 bands, 4 bands, 5 bands and 6 bands.

3 color band resistor

Parts

1.    Significant Value - serves as the primary value of a resistor. 
      
 In a 3 and 4 color band resistor, the first two colors are the significant values while in a 5 and 6 color band resistor, the first three colors are the significant values.

2.    Multiplier - is the value that is multiplied to the significant values.

  In a 3 and 4 color band resistor, the third color is the multiplier while in a 5 and 6 color band resistor, the fourth color is the multiplier.

3.    Tolerance - is the limit value in knowing if the resistor is defective or not.
  
  In a 3 and 4 color band resistor, the  fourth color is the tolerance while  in a 5 and 6 color band resistor, the fifth color is the tolerance.
  In a 3 color band resistor, tolerance is automatically 20 %



The formula in computing for the color coded value is:

CCV= Significant Value x Multiplier
where CCV= color coded value

Two Types of Tolerance:

a. Higher Limit
Steps in getting the higher limit:
1. Compute for the color coded value. (CCV=Significant Value * Multiplier)
2. Convert the tolerance value from percentage to decimal. (e.g. 20% becomes         0.20)
3. Multiply the CCV to the tolerance. (Computed Tolerance = CCV* tolerance)
4. After getting the CT (Computed Tolerance), add it to the CCV. (Higher Limit = CCV +CT)


b. Lower Limit
Steps in getting the lower limit:
1. Compute for the color coded value. (CCV=Significant Value * Multiplier)
2. Convert the tolerance value from percentage to decimal. (e.g. 20% becomes         0.20)
3. Multiply the CCV to the tolerance. (Computed Tolerance = CCV* tolerance)
4. After getting the CT (Computed Tolerance), add it to the CCV. (Lower Limit = CCV - CT)


4 Color Band Resistor

On a 4 color band resistor, the tolerance already have its color. Commonly silver or gold.

5 Color Band Resistor

A 5 color band resistor has 3 significant values.

6 Color Band Resistor

The temperature coefficient is the relative change of a physical property when the temperature is changed by 1 Kelvin. (www.wikipedia.com)