science 10

1. EQ: How are electricity and
magnetism related and how does it
affect our every day life?
PG. 79
PG. 79

2. MAGNETISM
A material that has aligned domains
with repulsive and attractive forces
ELECTRICITY
The movement of electrons from one
place to another

3. ELECTRICITY MAGNETISM
► How can you tell?
Compass needle moves when
near electrical current -
creating a magnetic field
Electric currents cause magnetism

4. ELECTROMAGNET
How to increase the strength of the
magnet
 More coils of wire= more current
 Increase voltage
 Add iron to the core
A temporary magnet made by wrapping a wire coil
carrying an electric current around an iron core.
https://www.youtube.com/watch?v=lSmuqLtmuwg
Junkyard electromagnet

5. 1. Straight wire
2. Single loop
Increasing the strength of the
magnetic field
(1-weakest, 4 –strongest)
3. Solenoid - A
single wire wrapped
into a cylindrical
wire coil
4. Solenoid with
iron core

6. ►Electric motors are used in most household
appliances which convert electricity into
mechanical energy (motion).

7. How does an electric motor
work?

8. Go to the next slide 
How does an electric motor work?

9. Simple as that!! How a speaker works
https://www.youtube.com/watch?v=DMxn3CPLe-A
How does an electric motor work?

10. MAGNETISM  ELECTRICITY
► How can you tell?
Electromagnetic induction
moving a magnet in and out of a
coiled wire created an electrical
current without a battery
Moving magnet can generate electricity
https://www.youtube.com/watch?v=hajIIGHPeuU
https://www.youtube.com/watch?v=20Vb6hlLQSg
Electricity generation
https://www.youtube.com/watch?v=AmWEs5CTQ3Q

11. Moving a loop of wire through a magnetic
field or moving a magnet through a loop of
wire produces an electric current.
https://www.youtube.com/watch?v=S3Qwf4P6x9w
Flashlight
https://www.youtube.com/watch?v=NqdOyxJZj0U
Pipe and magnet

12. A generator is used to convert mechanical
energy into electrical energy by
electromagnetic induction.

14. Dilbert

15. Maglev Trains
►Maglev trains are the new way to travel. It
uses both magnets and electricity to cause a
train to “levitate” above the track (and
reduce the resistance of friction).
►Video:
► https://www.youtube.com/watch?v=iaElPV0FWJ0

16. Changing Voltage
► Transformers work by the ratio of coils
to change voltage:
 Changing magnetic field
strength: If you have more
coils on the output side
than the input side, then
you increase voltage. If
you have less coils on the
output side, then you
decrease voltage.
 Video:
► https://www.youtube.com/watch?v=YQQ-mgjCpn8

17. • Both can cause
each other
• Likes repel
• Opposites attract
SUMMARY OF E & M
ELECTRICITY
► Can be + or -
► Can flow (current)
► Can jump (static)
E = Electricity and M = Magnetism are related!!
MAGNETISM
► Can NOT have only
1 pole
► Can be Normal (N)
or Reversed (S) pole
► Can move through
field
► Causes sun spots,
flares, CME

18. Closing Task
►Differentiate between an
electromagnet and
electromagnetic induction. How
are both used in your every day
lives

19. ►An electric motor is a device which converts
electricity to mechanical energy.
► An electromagnet turns inside of a permanent
magnet. By changing the direction of the current,
the poles will keep switching between N and S, and
therefore cause the electromagnet to continually
rotate.
►Electric generators do just the opposite. They
convert mechanical energy into electricity.
► They do this through a process of electromagnetic
induction. This is where an electric current is
generated by manually varying a magnetic field.
https://www.youtube.com/watch?v=d_aTC0iKO68