observing the color coding used on most resistors. Figure 1-4 lists
the color-coded values used in marking carbon resistors.
Figure 1-4.
Color Code for Resistors.
Several variations of resistors exist.
The symbol shown in figure
1-3 is that of a fixed resistor, one of a set or fixed value.
Resistors also may have variable values of resistance.
This may be
achieved by the use of variable resistors that may be adjusted, or
through the use of tapped resistors which have two or more selected
values of resistance. Figure 1-5 shows the symbols commonly used to
indicate variable and tapped resistors in schematic diagrams.
Figure 1-5.
Variable and Tapped Resistors.
b. Capacitors. Next to resistors, capacitors are the most common
components found in schematic diagrams.
Capacitors are capable of
storing electrical charges.
They have the ability to block direct
current (DC) while passing alternating current (AC).
The standard
symbols used to represent fixed capacitors are shown in figure 1-6.
In addition to the symbol, a capacitor is generally labeled with the
letter "C." The value of the capacitor may also be indicated.
The
basic unit of capacitance
4
OD1725
Previous Page
