Transcript Permanent magnets Electromagnets

3/25/10
Today’s Agenda
• Warm-Up: Station Introduction
• Classwork:
– Electricity and Magnetism Stations
– Electro vs. Permanent Magnets Venn
Diagram
– Electromagnet Review Worksheet (Group
Challenge)
• Homework:
– Key Questions 11-15 Due Tomorrow
– Study for Quiz 3 Tomorrow
• Conclusion:
Student Objective
Sunday, April 10, 2016
Students will be able to…
• Explain the important
understandings related to
electricity and magnetism
covered during the last 3
weeks of lessons.
Magnetism
• What is magnetism?
• What are magnetic fields?
• What are magnetic poles?
• What are magnetic
domains?
What can you do?
• Look at magnetic fields using oiled filled
plastic with iron filings.
• See how magnetic poles interact.
• Experiment with magnetic levitation.
• See where the magnetism is strongest by
picking up paper clips with various
magnets.
Static Electricity
• What is static
electricity?
• What happens when
static charges interact?
What can you do?
• Charge the plastic surface of the box full of
“pith balls” by rubbing with fur or felt and
see what happens.
• Charge the balloon and use it to cause the
aluminum can to roll across the floor in
static electricity races.
Circuits
• What is required to
create a simple circuit?
• What is the difference
between series and
parallel circuits?
Series Circuit
How does the brightness of each light bulb compare to each other?
What would happen if one of the light bulbs burns out?
Series Circuit
How does the brightness of each light bulb compare to each other?
What would happen if one of the light bulbs burns out?
Combination Circuit
B
A
C
How does the brightness of each light bulb compare to each other?
What would happen if bulb A burns out?
What would happen if bulbs B or C burn out?
What if bulbs B and C burn out?
What can you do?
• Construct simple series, parallel, and
combination circuits.
• Use 9-volt or hand crank generators to
power your circuits (BE CAREFUL WITH
THESE AND DON’T CRANK TOO HARD)
Electrochemical Cells
• What energy transformation occurs in
electrochemical cells?
• What are the 3 parts of a cell?
• What are the two types of cells we
made and how were they different?
• What is formed when 2 or more cells
are connected in series?
What can you do?
• Build dry cell (penny cell) batteries and
test the current created with the digital
voltmeter.
• Build wet cell batteries and test the current
with the digital voltmeter.
• See if you can create enough current to
power the digital clock.
Electromagnets
• What is an electromagnet?
• What is the principle behind the creation
of electromagnets?
• What is the difference between a
permanent magnet and an
electromagnet?
• What are the variables which can change
the strength of an electromagnet?
What can you do?
• Experiment with the discovery of
electromagnetism by seeing how the compass
needle moves when you crank the hand
generator to create electric current.
• Build electromagnets using the nails and wires
provided and test their strength.
• Experiment with variables using the already
created electromagnets… (PLEASE DO NOT
TAKE THESE APART!)
Compare and Contrast
Permanent Magnets and
Electromagnets.
Name:
Date:
Permanent
magnets
Class:
Electromagnets
Name:
Date:
Period:
Permanent
magnets Electromagnets
1. Cannot turn them off.
1. Both have
2. Get weaker over time or if magnetic lines of
force in an
dropped.
invisible field.
3. Cannot change their
poles.
4. Earth is a permanent
magnet.
5. Need no outside energy.
6. Were discovered over
2,000 years ago.
7. Are found in nature or
man-made.
8. Cause bio & geo
magnetism
2. Both have poles
(N & S) and can
be used to make a
compass.
3. Both attract and
repel.
4. Both can make
temporary
magnets from
iron, nickel,
cobalt,
neodymium,
samarium.
1. Can turn them off.
2. Can make them very
strong.
3. Can change their
poles.
4. Change electrical
energy into motion in
motors and sound in
speakers
5. Need electrical
energy.
6. Were invented in
1820.
7. Are man-made.
Names: ___________________
__________________________
__________________________
1. Draw an electromagnet in the space below.
2-5: Draw a line connecting each part of an
electromagnet below to the corresponding part
in your diagram.
2.
Energy Source
3.
Conducting Wires
4.
Solenoid
5.
Ferromagnetic Core
True or False
__________ 6. Electromagnets work because electric current creates a magnetic field.
__________ 7. Permanent magnets are more useful than electromagnets because they are always on and don’t
require an energy source.
__________ 8. An electromagnet can be strengthened by adding more loops, more current, or a stronger
ferromagnetic core.
__________ 9. The north and south pole of an electromagnet can be reversed.
__________ 10. The magnetic field lines for an electromagnet look similar to the field lines of a single bar magnet.
Name: ___________________
Class: ____________________
1. Draw an electromagnet in the space below.
2-5: Draw a line connecting each part of an
electromagnet below to the corresponding part
in your diagram.
2.
Energy Source
3.
Conducting Wires
4.
Solenoid
5.
Ferromagnetic Core
True or False
__________ 6. Electromagnets work because electric current creates a magnetic field.
__________ 7. Permanent magnets are more useful than electromagnets because they are always on and don’t
require an energy source.
__________ 8. An electromagnet can be strengthened by adding more loops, more current, or a stronger
ferromagnetic core.
__________ 9. The north and south pole of an electromagnet can be reversed.
__________ 10. The magnetic field lines for an electromagnet look similar to the field lines of a single bar magnet.
HOMEWORK
DUE FRIDAY
1.Project Step 4
2.Key Questions 11-15
3.Quiz 3 – Electricity & Magnetism
Always copy daily homework into your agenda.