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Electrical
Technology
Basics of electricity and
electrical technology
Electricity
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Atoms – The smallest unit
of each element
Electrons – negatively
charged particles in
atoms
Ions – charged atoms or
molecules
Magnets – A metal with
opposite charges on each
side.
Magnets can be used to
create electricity.
Static Electricity
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Lightning
Charge Build up
Energy Release
Path of Least
Resistance
Electric Circuits
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Electricity flowing
through a substance
is called an electric
current.
Conductors – Low
resistance
Insulators – High
resistance
Schematic Symbols
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A drawing of an
electric circuit is
called a schematic.
Symbols
 Resistor
 Battery
 Switch
Source
Ohms Law
V – voltage or electrical potential
 I – current or electrical flow
 R – resistance or load
 Ohms law states:
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V
= IR
Series and Parallel Circuits
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Series circuit - has
only one path through
which the electricity
can flow.
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Parallel circuit - has
multiple paths through
which the electricity
can flow.
Switches
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Switches are used to
control circuits.
Switches connect or
disconnect all or part of a
circuit.
Switches come in many
forms.
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SPST
SPDT
DPST
DPDT