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f-alpha.net » Electronics » Basic Electronics » Resistor » Get Started... » Resistors

The Resistors

In addition the maximum power a resistor can dissipate is indicated. In the experiments you use resistors with a power dissipation of 0.25 watts.

A selection of resistors of different resistance values. (Enlarge)

Circuit symbol resistor.

The Resistor

The resistance of a resistor is provided with the units of Ohm and indicated by the symbol Ω. As symbol in formulas and in circuit diagrams R is used.

Commonly used resistors have an electric resistance between a few Ω and a few million Ω...

1 kilo-ohm     = 1 kΩ    = 1,000 Ω

1 mega-ohm    = 1 MΩ   = 1,000,000 Ω

The value of a standard resistance is not printed on the component, but indicated with four colored rings, the color coding. In order to "read" the value you use the table shown...

Color 1. Ring 2. Ring 3. Ring
black   0 1
brown   1 1 10
red   2 2 100
orange   3 3 1,000
yellow   4 4 10,000
green   5 5 100,000
blue   6 6 1,000,000
purple   7 7 10,000,000
gray   8 8 100,000,000
white   9 9 1,000,000,000

Color coding of resistors with 4 rings.

Example...

1. color ring: yelow        = 4
2. color ring: purple     =   7
3. color ring: orange    =      times 1,000
Result:                  = 47,000 Ω = 47 kΩ

The fourth color ring indicates the tolerance. In our example, the fourth color ring is gold, hence the tolerance is 5%. The resistance can therefore have any value between 44,650 Ω and 49,350 Ω.

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