Transcript circuits - TeacherWeb

CIRCUITS
Chapter 13.3
Electric Circuit
• An electrical device connected
so that it provides one or more
complete paths for the
movement of charges.
Schematic Diagram
• A graphic representation of an
electric circuit or apparatus,
with standard symbols for the
electrical devices.
Wire or Conductor
• Wires that
connect
elements are
conductors.
Resistor
• Wires with
multiple bends
indicating
resistance to a
straight path.
http://images1.wikia.nocookie.net/en.futurama/images/0/0d/200px-Resistor_symbol_America.svg.png
Bulb or Lamp
• The winding of the
filament indirectly
indicates that the
light bulb is a
resistor.
http://cnx.org/content/m14370/latest/Schematic.png
Battery or Direct Current Source
• The difference in line
height indicates a
voltage between positive
and negative terminals of
the battery. The taller line
represents the positive
terminal of the battery.
http://cnx.org/content/m14370/latest/Schematic.png
Switch
• The small circles
indicate the two places
where the switch
makes contact with
the wires. Most
switches work by
breaking only one of
the contacts.
Open switch
Closed switch
http://www.highschoolresource.energyaustralia.com.au/studentsElectricCircuits.html
Series Circuits
• A circuit that provides a single path for
current to flow.
• As you add resistors, the total resistance
(RT) of the circuit increases causing the
total current to decrease.
• The current through each resistor is the
same no matter what the value of the
resistor.
• The voltage of the battery is shared
between each resistor.
Series Circuit
• If three lamps are connected in series and
one lamp burns out, all the lamps are not
going to light. The circuit will be broken.
• As identical lamps are added in series, the
light will get dimmer because less current
is flowing through the lamps
Parallel Circuit
• A circuit that provides two or more paths
for current to flow.
• As you add resistors, the total resistance
(RT) in the circuit decreases causing the
total current to increase.
Parallel Circuit
• The current through each resistor
depends on the value of that particular
resistor. The higher the resistance, the
lesser the current that passes through the
resistor.
Parallel Circuit
• The voltage of the battery is the same
across each resistor. Each resistor gets
the same voltage value of the battery.
Parallel Circuits
• If three lamps are connected in parallel
and one lamp burns out, all the other
lamps are still going to light. There is still
a circuit intact.
Parallel Circuit
• As identical lamps are added in parallel,
the brightness of the lamps will not
change. More current is added.
Series Circuit
Parallel Circuit