BASIC ELECTRONICS - OD1633 - LESSON 1/TASK 1
6.
Electrical Resistors
Resistance is a property of every electrical component.
Sometimes its
effects will be undesirable.
However, resistance is used in many varied
ways. Resistors are components manufactured to possess specific values of
resistance.
They are manufactured in many types and sizes.
When drawn
using its schematic representation, a resistor is shown as a series of
jagged lines, as illustrated in figure 8 on the following page.
FIGURE 7.
OHM'S LAW TN DIAGRAM FORM.
a. Composition of Resistors. One of the most common types of resistor
is the molded composition, usually referred to as the carbon resistor.
These resistors are manufactured in a variety of sizes and shapes.
The chemical composition of the resistor determines its resistance and is
accurately controlled by the manufacturer in the development process. They
are made in values that range from one Ohm to millions of Ohms.
The
physical size of the resistor is related to its wattage rating, which is the
ability of the resistor to dissipate beat caused by the resistance.
Carbon resistors, have as their principal ingredient the element carbon. In
the manufacture of carbon resistors, fillers, or binders are added to the
carbon to obtain various resistor values.
Examples of these fillers are
clay, Bakelite,
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