DC CIRCUIT TERMINOLOGY
Basic DC Theory
DC CIRCUIT TERMINOLOGY
Before operations with DC circuits can be studied, an understanding of the types
of circuits and common circuit terminology associated with circuits is essential.
EO 1.4
Given a diagram, IDENTIFY it as one of the following
types:
a.
Schematic diagram
b.
One-line diagram
c.
Block diagram
d.
Wiring diagram
EO 1.5
DEFINE the following terms:
a.
Resistivity
b.
Temperature coefficient of resistance
c.
Closed circuit
d.
Open circuit
e.
Short circuit
f.
Series circuit
g.
Parallel circuit
h.
Equivalent resistance
EO 1.6
Given a circuit, DETERMINE whether the circuit is an
open circuit or a closed circuit.
Schematic Diagram
Schematic diagrams are the standard means by which we communicate information in electrical
and electronics circuits. On schematic diagrams, the component parts are represented by graphic
symbols, some of which were presented earlier in Module 1. Because graphic symbols are small,
it is possible to have diagrams in a compact form. The symbols and associated lines show how
circuit components are connected and the relationship of those components with one another.
As an example, let us look at a schematic diagram of a two-transistor radio circuit (Figure 9).
This diagram, from left to right, shows the components in the order they are used to convert
radio waves into sound energy. By using this diagram it is possible to trace the operation of the
circuit from beginning to end. Due to this important feature of schematic diagrams, they are
widely used in construction, maintenance, and servicing of all types of electronic circuits.
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