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Transcript
 Covers
two main areas:
 - Electricity
 - Electronics
 All
appliances and electrical devices
depend on electrical circuits
Electrical component are made with a
particular
type of material:
- Semiconductor (silicon)
- Conductors (metals & alloys)


Direct current (DC): is an electric
current in which the electrons
are continuously moving in the
same direction.
Alternating current (AC): is an
electrical current in which the
electrons move back and forth in
a regular pattern
 Is
the role that a component plays in the
control or transformation of electric
current.
 Power
supply: is the electrical function
preformed by any component that can
generate or provide an electric current in
a circuit



Battery: Transforms
chemical energy into
electrical energy
Advantages: portable,
many appliances run on
batteries
Disadvantages:
batteries must be
replaced, contaminate
the environment around
the landfill by leaking
heavy metals



Electrical outlet:
contains contacts and is
permanently connected
to an electrical network
Advantages: stable and
long lasting power
supply
Disadvantages:
hydroelectric dams
cause flooding of vast
areas of land. Appliances
cannot be moved far
from the wall outlet



Photovoltaic cell: (solar
cell) electronic device that
generates an electrical
current when exposed to
light.
Advantages: portable, do
not produce green house
gases, have a lifespan of 20
to 30 years.
Disadvantages: Depends
on sunny conditions. Much
more expensive to install
than other sources of
power.
 Conduction:
 When
a component
can transmit electric
current from one part
of a circuit to another
 Examples
of
conductors: copper,
gold, etc...
 Insulation
:
 When
a component
prevents an electric
current from flowing.
 Examples
of
insulators: ceramic,
rubber, plastic


Fuses
A filament
melts/breaks if
current exceeds a
certain level


Breakers
A strip becomes hot
and bends if current
exceeds a certain level.
A switch is thrown to
restore circuit
operation


Closed circuit: electric
current flows in a loop
Open circuit: electric
current cannot flow in a
loop
 P. 479
 #1
to 8, 10, 11, 13, 15
 The
transformation of energy is the
electrical function performed by any
component that can convert electrical
energy into another form of energy
 Chemical
 Thermal
 Mechanical
 Radiation




Incandescent light bulbs
(luminous energy)
Heating elements
(thermal energy)
Piezoelectric crystals
(mechanical energy)
Electromagnets
(magnetic energy)