Download Wednesday- Circuits

Circuits
• What is electricity and how can you transfer it
through circuits?
• What are the differences between parallel and
series circuits?
• What are the advantages and disadvantages
of using serial and parallel circuits?
- Electric Current
Flow of Electric Charges
• Electric current is the continuous flow of
electric charges through a material. Measured
in amps.
Review Questions
An electric current either transfers charges well
or not very well.
1. What is something called that transfers energy
well? (Ex. Metals)
2. What is something called that does NOT
transfer energy well? (Ex. Non-metals)
Electric Charges
• A conductor transfers
electric charge well.
• Metals are good
conductors. Silver, copper,
aluminum, and iron are
metals.
• An insulator does not
transfer electric charges
well.
• Rubber, glass, plastic, and
wood are good insulators.
The rubber coating on an
electric cord is an insulator.
- Electric Current
Electric Circuit
• An electric circuit is a complete, unbroken
path through which electric charges can flow.
- Electric Circuits
Parts of a Circuit
Parts of a circuit
Energy source
Resistor
Wires
Switch
Load
Comprehension Check
1. What is a circuit?
2. What is an example of a circuit?
- Electric Circuits
Series Circuits
• In a series circuit, there is only one path for
the current to take.
- Electric Circuits
Parallel Circuits
• In a parallel circuit, there are several paths for
the current to take.
- Electric Circuits
Series and Parallel Circuits Activity
• Click the Active Art button to open a
browser window and access Active Art
about series and parallel circuits.
Complex Circuit
• a circuit that has more than one parallel or
series circuit linked together
Comprehension Check
1. What is an electrical circuit?
2. What are the 3 types of circuits?
- Electric Power
Electric Power
• The rate at which energy is transformed from
one form to another is known as power.
Power is measured in watts (W).
Voltage
• Voltage causes a current in an electric circuit.
• Voltage is the difference in electrical potential
energy between two places in a circuit. The unit of
measure of voltage is the volt (V).
• The energy that makes charges flow through a
circuit is called electrical potential energy.
• An electric circuit needs a source of energy to have
voltage. Voltage sources: a battery, a generator
- Electric Power
Calculating Power
A household light bulb has about 0.5 amps of current in
it. Since the standard household voltage is 120 volts,
what is the power for this bulb?
• What are you trying to calculate?
The power of the light bulb = ?
• What is the formula?
Power = Voltage X Current
• Calculate.
Power = 120 V X 0.5 A
Power = 60 W
- Electric Power
Comprehension Check
Question
What is electric
power?
Answer
Electric power is the rate at
which electrical energy is
transformed into another
form of energy.
- Electrical Safety
Electrical Equipment and Fires
Reading Graphs:
– What determines the size of
each wedge in the graph?
– The percentage of fires
caused by a certain type of
electrical equipment
Electrical Equipment and Fires
Reading Graphs:
– What percentage of fires are
caused by appliances?
– 15%
- Electrical Safety
Electrical Equipment and Fires
Interpreting Data:
– Which category of
equipment is responsible for
the most fires? Which
category is responsible for
the fewest fires?
– Cooking equipment is
responsible for the most
fires. Heating and cooling
equipment is responsible for
the fewest fires.
Summary
• Identify pictures of circuits as parallel or
series.
- Electric Circuits
Thursday Warm Up
Compare and contrast series circuits and
parallel circuits in a Venn diagram.
Series Circuit
Only one path
for current to
take
Parallel Circuit
Unbroken
path that
has a
current
Several paths
for current to
take