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Name:____________________________________________
Electricity and Magnetism Movie Notes
1. What causes the Earth’s magnetic field?
2. Why does heating demagnetize a magnet?
3. When the flow of _________________________________ stops, the magnetism stops.
4. Name three household devices that use electromagnets.
5. Where is electromagnetic induction used?
6. How fast (in miles per hour) does the maglev train travel? _______________________mi/hr
7. The absence of ____________________________ between the train and the track is why the train
can go so fast.
Section 8.3 Properties of Magnets (p.203-210)
1. Define Permanent Magnet: _________________________________________________________
__________________________________________________________________________________
2. Define Electromagnet: ____________________________________________________________
__________________________________________________________________________________
3. Define Electromagnetic induction: ___________________________________________________
__________________________________________________________________________________
4. A magnet fills the space around itself with a kind of ______________________ energy called the
magnetic field.
5. The force from a magnet gets ______________________ as it gets farther away
6. We now know that magnetism is created by _____________________ current and that
electricity and magnetism are two forms of the same basic ____________________.
Name:____________________________________________
7. The north and south poles of an electromagnet are on ______________________ ends of the coil.
8. More __________________________ creates a stronger electromagnet.
9.
The metals _____________________, _______________________, and ____________________
have strong magnetic properties.
10. If you move a magnet near a coil of wire, an electric current is __________________ in the coil.
11. Current is produced only if the magnet is ______________________ because a
_____________________ magnetic field is what creates current.
12. Before going through a transformer the current is _________ amp and the voltage is
______________ volts. After passing through a transformer, the current is ______ amp and
the voltage is ______________ volts. The amount of power stays the same.
Questions (answer in complete sentences):
13. What mistake was made when assigning the north and south poles of the Earth?
14. Explain two differences between a permanent magnet and an electromagnet.
15. Right Hand Rule: When the fingers of your _________________ hand curl in the direction of the
current, your _____________ points to the electromagnet’s ________________ pole. Use the
right hand rule to determine which magnetic pole is at the pointed end of the electromagnet in
figure 8.26 on page 211.
_______________________ pole is the pointed end of the nail
16. Give an example of how animals use their own biological compasses. (p. 205 in the green box)