has a 20 percent tolerance, a silver fourth band has a 10 percent tolerance,

and a gold fourth band has a 6 percent tolerance. In some cases, the third

band will be silver or gold. It then becomes a multiplier, and you multiply

the first two bands by 0.01 if it is silver, and 0.1 if it is gold.

Resistors that conform to military specifications have an additional fifth

band.

The fifth band indicates the reliability level per 1000 hours as

follows:

Fifth band color

Level

Brown

1.0%

Red

0.1%

Orange

0.01%

Yellow

0.001%

In applying the reliability level table for a resistor color coded brown,

the chance of failure will not exceed 1 percent for every 1000 hours of

operation of that resistor.

In a piece of equipment containing 10,000

orange fifth band resistors, it means that no more than one resistor will

fail during 1000 hours of operation. This is very good reliability.

Both wirewound and composition resistors will not use the resistor color

code. These resistors will have the ohmic value and tolerance imprinted on

the resistor itself.

7.

Conclusion

In this task, we covered the elements of electricity, safety requirements to

be used when working around electricity, voltage, current, resistance

functions, Ohm's law, and resistor color codes.

In the next task, we will cover series, parallel, and series-parallel

circuits. We will also measure and compute voltage and current of batteries

connected in series--parallel circuits.