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Transcript
Essential Question: How do
electrons get transferred:
Conduction
Induction
Friction
What is the law of
conservation of charge?
Charges are not created nor
destroyed, they are transferred from
one object to another.
Explain why a sock might stick
to a sweater after they have been
in the dryer?
The friction (from rubbing) between
the sock and the sweater causes
one to lose electrons and the other
to gain electrons, making them
electrically charged. They will get
attracted to each other since they
have opposite charges.
Your Question : What is the
difference between a
cation and anion?
Cations: lose electrons and become
positively charged.
Anions: gain electrons and become
negatively charged.
Essential Question: How can I
tell if something is charged?
(pg. 13)
By using an electroscope. The
leaves of an electroscope will
repel each other if you bring a
charged object close to it.
What tool is used to detect
electric charge?
Electroscope
Your Question: What is static
electricity?
Build up of electrons
Essential Question: What is
Ohm’s Law? (p.g 17)
The relationship between current,
voltage, and resistance. It is
represented in the following
equation:
V = IR
What is current?
Current is the flow of electrons
What happens to the resistance of a
light bulb as it heats up?
As the light bulb heats up the
resistance increases.
Your Question: What is the
equation for Ohm’s law? What
does each symbol mean?
V = IR
V= Voltage, measured in volts (V)
I = Current, measured in Amps
(A)
R= Resistance, measured in
Ohms (Ω)
How are semiconductors used
in circuits? (pg. 23)
They are used in diodes and
transistors.
What is a diode?
Electronic component that
converts an AC current to DC
current.
What devices around my
home use diodes?
Solar panels, TV remotes, light fixtures
What are transistors?
Electronic device that converts small
amount of current to large amount of
current.
Essential Question: What is a magnet?
(pg. 25)
It is an object that attracts iron, or
attracts objects that contain iron.
Where does a magnet create the
strongest magnetic force?
At the poles (N and S poles)
Your Question: What is an
electromagnetism?
Magnetic field produced by electric
current.
Where does a magnet create the
strongest magnetic force?
At the poles
How could a regular iron nail be
turned into a magnet?
By wrapping a wire around it and
running a current through the wire.
Your Question:
How could a magnet get destroyed?
1. By Striking it really hard (ie. Strike it with
a hammer)
2. By heating up the magnet
What happens if you cut a magnet in half?
You will end up with two perfectly
functioning magnets each with a north and
south pole.
Essential Question: What does a
generator do? (pg. 29)
It changes mechanical energy into
electrical energy.
What kind of energy conversion does
an electric generator do?
It converts mechanical energy into
kinetic energy.
Explain how burning fossil fuels can help us
make electrical energy?
Burning fossil fuels  heat water  turns
water into steam Steam rises  turns
turbines that are connected to generators 
generator creates electricity.
Where are electric generators used?
They are used in electric power
plants to generate electricity.
Essential Questions: What is an electric
motor? (pg. 31)
Device that changes electric energy
into kinetic energy.
What kind of energy conversion does
an electric motor do?
It converts electric energy into
kinetic energy.