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Name _____________________________________________date _________ period __
Physical Science
Unit 6
1. Permanent magnets – are magnetic all the time (___________________) Other
substances can be made into _______________ magnets by placing a strong
permanent magnet __________ them or by stroking them with a permanent magnet.
2. Materials are classified as either magnetically __________ or ________. Hard –
easily __________________ but looses magnetic properties easily. Soft – difficult
to magnetize but ________ ________ ________________ its magnetic properties.
3. Magnetic Force - the ____________________ __________ exerted by magnets. It
depends on: * the _______________ of the magnet * the ___________________
an object is from the magnet
4. Magnetic Poles - Magnets have a pair of _____________, a north pole and a south
pole. Like poles _____________ (S/S or N/N) Unlike poles ________________
(N/S) Just like with ______________________ ___________________
5. Magnetic Fields - The ________________ where a magnetic force can be _______.
Magnetic Field lines are used to show the ___________________ field. A _______
needle will always point along a ______________ _________. The lines are close
together where the magnetic force is __________, and spread out where it is ______
6. Earth as a Magnet - Earth acts like a giant ________ magnet. It has a ___________
and ____________ pole. These magnetic poles are not the same as the __________
poles. The pole that is above Canada is actually a magnetic ______________ pole
and the one in Antarctica is a _______________ pole – to reduce confusion they are
named for the ___________________ pole
7. Earth’s magnetic field has ________________ direction more than _____ times in
the last 5 million years.
8. Magnetism and Electric Current - In 1820, Hans Oersted found that _____________
is produced by moving ________________ _____________ by experimenting with
the effects of an electric current on the _________________ of a compass.
9. A ______________-carrying wire creates a ________________ field that forms in
concentric circles ____________ the wire. Right Hand Rule – if you hold a wire in
your right hand with your thumb pointing in the direction of the____ current, your
fingers would curl in the direction of the _____________________ field.
10.The ________________ field created by the current-carrying wire is very ________
To create a __________________ magnetic field: Increase the ____________ in
the wire Wrap the wire in a ____________ (solenoid)
11.Solenoids - Each __________ of wire adds to the ______________ of the magnetic
field of the loop next to it. The _________________ of the magnetic field depends
on the ________________ of loops of wire and the amount of ________________
in the wire.
12.Electromagnet - If you add an ___________ rod in the
center of the _____________ (in a solenoid) it will create an
___________________. This adds to the magnetism of the
coil creating a ____________________ magnet.
13.Electromagnetic Devices - _____________________ – used to measure _________
in ammeters and voltage in voltmeters. Electric motors – convert _______________
energy to ___________________ energy to cause motion. Stereo speakers –
magnetic ______________cause motion that produce ________________ waves
14.Faraday’s Law - An _________________ current can be produced in a circuit by a
_________________________ magnetic field. Electromagnetic _______________
-moving a ______________ in and out of a coil of ______________ - causes
charges in the wire to move.
15.Electric Generator - converts ___________________ energy to ________________
energy by electromagnetic induction
16.Alternating Current (____) - For each ½ rotation of the ___________ loop, the
current produced by the generator _____________________ direction or alternates.
17.Electricity in Your Home - The electricity you use in your home is created by large
______________________ at the power plants. The ___________________energy
used to power the _____________________ can come from: Running water (dams),
burning coal, nuclear fission, wind, hot water (geothermal)
18.The ________________________ coming from a power plant is too strong for you
to use in your home.
19.Transformers - _______________ or __________________ the voltage so that it
can be used. Step up – _______________ voltage primary coil < secondary coil
Step down – _________________ voltage primary coil > secondary coil