The Resistors

Resistors are available in a variety of versions and resistance values​​. In these experiments, you work with resistors with a fixed resistance value. The components are therefore often referred to as fixed 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 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.