Electrical Principles
Electricity
Electricity
Electricity is a form of energy created by the
movement of electrons. Directing these electrons
through a circuit, we can perform work. Electricity
can produce light, heat, magnetism or mechanical
work.
Figure 1
Basic System Requirements
Basic System Requirements
Every electrical system requires 3 basic compo-
nents and usually 2 accessory components.
1:
2:
3:
Power Source
Load Device
Conductors
“Accessory Components.”
4:
5:
Switch
Fuse
Basic Circuit Types
Figure 2
Series Circuit
Series Circuit
A series circuit is a circuit that may include more
than one load.
Characteristics of a series circuit:
1:
2:
The current is constant through out the circuit.
The current must pass through each component
in the circuit.
Figure 3
3:
The total resistance of the circuit controls the
current in the circuit.
4:
The total resistance of the circuit is the sum of
all the resistance’s in the circuit.
The sum of the voltage drops across the resis-
5:
tors will equal the applied voltage.
Resistance in a series circuit equals the sum of all
resistance’s (that is, R = R1+R2+R3+ etc...)
2
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