Chapter 13
  Resistor
   
  Resistors limit current on a circuit.

How can we read a resistor? It is very easy. On the resistor, there are several colors. Color used are black, brown, red, orange, yellow, green, blue, violet, gray, and white.

   
  A resister This resistor has colors of red, orange, green, and gold.

Resistance can be calculated by

R = (First digit * 10 + second digit) * multiplier.

Therefore,

R = (Red * 10 + Orange) * Green = (2 * 10 + 3) * 100,000 = 230,000 ohm.

Tolerance of silver is + 10 %
Tolerance of gold is + 5 %.

     
  Here is the color table for calculating resistance:  
 
Color 1st digit 2nd digit Multiplier Tolerance
Black 0 0 1 Silver/Gold
Brown 1 1 10 Silver/Gold
Red 2 2 100 Silver/Gold
Orange 3 3 1000 Silver/Gold
Yellow 4 4 10000 Silver/Gold
Green 5 5 100000 Silver/Gold
Blue 6 6 1000000 Silver/Gold
Violet 7 7 10000000 Silver/Gold
Gray 8 8 100000000 Silver/Gold
White 9 9 1000000000 Silver/Gold

 

  Example Problems

What is the resistance of each resistor?

  Diode a ohm
  Diode b ohm
  Diode c ohm
  Diode d ohm
  Diode e ohm
  Diode f ohm
  Diode g ohm
  Diode h ohm

 

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