BASIC ELECTRONICS - OD1633 - LESSON 1/TASK 1
rubber and talc.
These fillers are doping agents and cause the overall
conduction characteristics to change.
Carbon resistors are the most common resistors found because they are easy
to manufacture, inexpensive, and have a tolerance that is adequate for most
electrical and electronic applications.
Their prime disadvantage is that
they have a tendency to change value as they age. One other disadvantage of
carbon resistors is their limited power-handling capacity.
FIGURE 8.
TYPES OF RESISTORS.
The disadvantage of carbon resistors can be overcome by the use of wirewound
resistors.
Wirewound resistors have very accurate values and possess a
higher current-handling capability than carbon resistors. The material most
frequently used to manufacture wirewound resistors is German silver which is
composed of copper, nickel, and zinc. The qualities and quantities of these
elements that are present in the wire determine the resistivity of the wire.
The resistivity of the
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