Resistors wid colour code

Color Code
- Fun with Resistors
     Resistive Attenuator Design
          Intuitive Electronics Page

 Fig of resistor               
Symbol of resistor

                     

1/4 watt Fixed type resistor

    
       
Single Turn Trimmer  -   Potentiometer

                   
Multi-turn Trimmer   -  Potentiometer

                             
 Wire Wound Resistor tied as a
Rheostat

                             
    Wire Wound Resistor tied as a
Voltage Divider

Resistors do a lot of Useful Things!

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 Voltage to Current Convertor 


When driving the input (base) of a transistor gain stage:

you must convert the input voltage to a current by using 

a voltage to current convertor 

--a resistor.

Current to Voltage Convertor


When deriving a voltage from the collector of a transistor amplifier stage: you
convert the                                                                 


output (collector) current into a voltage by using a Current to Voltage
convertor in the

 collector circuit--you  guessed it--a resistor.

Resistance is Determined partially by Composition, 

and is inversely proportional to
Cross Sectional Area

Notice Also that
Resistance is proportional to Length

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Resistor-
Color
-Code

4 Band Color Code

Be Careful when reading 5 and 6 Band
Resistors

Note: the 3rd Digit is not used when reading the 4 band resistor