Resistors by suchenfz

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```									      Lesson 2
Resistors
Resistor colour codes
Capacitors
Resistors
   Provide resistance to the flow of electrons
   Limit the flow of current
   Imagine squeezing a hose pipe, the amount of
water passing through the pipe will be less

   Can be rated by…
   Resistance - measured in Ohms (Ω)
   Tolerance (% of nominal value)
   Power Rating (Watts)

   Schematic Symbol…
Resistors – Types

 Fixed

   Variable (Potentiometer, Rheostat)
Resistors

Use the colours to work out
the value of the resistor     0 - black
1 - brown
2 - red
3 - orange
4 - yellow
5 - green
6 - blue
7 - purple
8 - grey
9 - white

gold - 5%
silver – 10%
0 - black
1 - brown
Resistors - Example 1                                2 - red
3 - orange
4 - yellow
5 - green
6 - blue
7 - purple
8 - grey
9 - white

gold - 5%
silver – 10%
First number         Tolerance
2
5%

6
Second number   Number of 0’s     Resistance = 260Ω
1 zero
Resistors – Example 2
First number                Tolerance
3                                                   0 - black
5%
1 - brown
2 - red
3 - orange
3
4 - yellow
Second number          Number of 0’s
5 - green
2 zeros
6 - blue
7 - purple
8 - grey
       1st band: orange = 3                         9 - white

       2nd band: orange = 3                         gold - 5%
silver – 10%
       3rd band: red = 2 zeros
       4th band: gold = 5%     Resistance = 3300Ω or 3.3 kΩ
More Examples                           0 - black
1 - brown
2 - red
470000 Ω
3 - orange
470K Ω      4 - yellow
1000 Ω      5 - green
1K Ω        6 - blue
7 - purple
56 Ω        8 - grey
9 - white
1500 Ω
gold - 5%
1.5K Ω
33000 Ω     silver – 10%

33K Ω
6400000 Ω
6.4M Ω

1000 Ω = 1KΩ
1000000 Ω = 1000K Ω =1M Ω
Resistors – 5 Band Colour Code
Resistors – Typical Power
Ratings
Capacitors
   Stores electric charge
   Two metal plates separated by an
insulator
   Different Designs
Capacitors
   Measured in Farads (F) but
generally not this large, usually:

   Schematic Symbol….

or
Capacitors
   Slowly charges up until the voltage
is the same as the battery
   Can store the charge for a long time
or until a conductor is connected
across it
   Several uses
   AC to DC converter
   Timing circuits
Common Capacitor Types

Surface mount

Disc
Electrolytic – polarized

High Voltage
Questions:
     Use the colour code chart to complete these:
1st Number   2nd Number        3rd Number   4th Number   Resistor Value

Red          Blue              Orange       Silver

Green        Black             Brown        Gold

Yellow       Violet / Purple   Black        Gold

White        Gray              Red          Silver

Orange       Orange            Yellow       Gold

360 Ω ±5%

10 Ω ± 10%

4700 Ω ± 5%

5 Ω ± 10%

8000 Ω ± 5%

33000000 Ω ± 5%

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