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ELECTRICAL THEORY
In order to diagnosis any electrical system there are
few things the technician must know:
•
Basic electrical values.
•
Ohm's law.
•
Kirchhoff's current law.
•
Kirchhoff's voltage law.
•
How the system is wired together.
The first electrical value to be discussed is Voltage.
•
Voltage is the "pressure" that electricity has. It is
the amount of force pushing electrons through a
circuit.
•
This pressure is measured in volts.
•
The capital letter "V" is used to represent volts.
The second electrical value is Current:
•
Current is the "flow" of electricity. It is the amount
of electrons flowing in circuit.
•
The flow of current is measured in Amperes or
Amps for short.
•
The capital letter "I" is used to represent Amps.
The third and final value is Resistance:
•
Resistance is the opposition to current flow. It is
a restriction that slows down the flow of current.
•
Resistance is measured in Ohm's.
•
The greek letter omega "
Ohm's.
CHAPTER 2: ELECTRICAL SYSTEM
Ω"
is used to represent
Ohm's law
Ohm's law state that voltage is the product of resis-
tance times current. It is written as V=IxR. An example
of how ohm's law works goes like this: It takes 1 volt to
push 1 amp through a resistance of 1 ohm (1=1x1).
Ohm's law can be drawn in a triangle. When using the
triangle, cover the value to be found, and the two val-
ues left exposed signify how to obtain that value.
See Figure 2.1.
As an example if the "R" is covered, the "V" is over the
"I" which means V is divided by I. If the "V" is covered,
"I" and "R" is exposed, meaning IxR and so on.
3
ELECTRICAL SYSTEM
V
R
I
Figure 2.1
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