Download Electromagnet Review Slides

Name: ________________
Class: ________________
Directions: Use pages 38-40 of the electricity and magnetism textbook to answer the following questions.
1. What is a solenoid?
A solenoid is a current carrying coil of wires with many loops.
2. What can be placed inside a solenoid to strengthen the magnetic field?
Any ferromagnetic material can be placed inside a solenoid to strengthen the
magnetic field.
3. What is an electromagnet?
An electromagnet is a solenoid with a ferromagnetic core. It is also a strong
magnet that can be turned on and off.
4. What are the 4 ways that you can increase the strength of an electromagnet?
1. You can increase the current in the solenoid.
2. You can add more loops of wire to the solenoid.
3. You can wind the coils of the solenoid closer together.
4. You can use a stronger ferromagnetic material for the core.
solenoid
5. _____________________________
(coil of wires)
conducting wire
7. _____________________________
ferromagnetic core
6. _____________________________
energy source
8. _____________________________
9. What are 3 benefits of using an electromagnet instead of a
regular magnet?
Can turn the power on and off
Can control the strength (make stronger)
Can switch the North and South poles
Permanent magnets
1. Cannot turn them
off.
2. Get weaker if
dropped or heated.
3. Cannot change
their North and South
poles.
4. Earth is an
example
5. Need no outside
energy.
6. Were discovered
over 2,000 years ago.
7. Can be found in
nature or human
made.
Both
1. Have an invisible
magnetic field
2. Have poles (North &
South)
3. Can be used to make
a compass.
4. Attract and repel.
5. Can make temporary
magnets from iron,
nickel, cobalt,
neodymium, samarium.
Electromagnets
1. Can turn them off.
2. Can make them
stronger,
3. Can change their
North and South poles.
4. Need electrical
energy.
5. Were invented in
1820.
6. Are always human
made.
7. A scrap yard crane is
an example.
Name: ______________________
Date: _______________________
Class: ______________________
Part 1 -
Click on the links provided to complete the activities and answer the accompanying questions.
http://www.ndt-ed.org/EducationResources/HighSchool/Magnetism/electromagnets.htm
1. Describe one use for powerful electromagnets.
Part 2 - Use the following website to fill in the table and investigate how an electromagnet functions.
http://archive.fossweb.com/modules3-6/MagnetismandElectricity/activities/electromagnet.html
Power Supply
(AC or DC)
Volts
(10, 50, or 100)
Wire Gauge
(Thick, Med, or Thin)
AC
Wire Type
(Al, Cu, or String)
# of Winds
(in tens)
Al
Filings
Remaining
463
0
DC
100
Med
50
DC
50
100
278
80
401
Cu
Med
481
60
500