Warm-Up Activity 2/2/09 <ul><li>Get a MAGNETISM ATTRACTION WKT. </li></ul><ul><li>Staple it in your science journal. </li></ul><ul><li>Work with your shoulder partner to complete the assignment. </li></ul><ul><li>You will have about 10 minutes to complete this mini-lab. </li></ul>
Electrical Power - the rate at which electrical energy is changed into other forms of energy; measured in watts
How can series and parallel circuits be used to control the amount of electric energy produced?
The resistance in a series circuits is increased by adding loads (slows down the flow of electrons) whereas the resistance in a parallel circuits is decreased by adding loads (increase the flow of electrons).
For an object to be magnetic, most of its domains (tiny magnetic fields produced by spinning electrons) must line up in the same direction.
Losing Magnetic Alignment by: a) Dropping a magnet or hitting it too hard b) Putting magnet in opposite field for too long c) Increasing the temperature
What do you think would happen if you cut a magnet in half? (Not in your notes – Add in left column)
If you cut a magnet in pieces, each piece will still be a magnet with two poles.
Why does a compass point to the Earth's North Pole?
Why does a compass point to the Earth's North Pole? A compass points to the Earth’s North Pole because the Earth acts like a giant magnet. Earth has a north magnetic pole and a south magnetic pole. Earth’s magnetic poles are not exactly the same locations as the geographic poles (axis where the Earth spins).
Why does a compass point to the Earth's North Pole? A compass needle points north because the magnetic pole of Earth that is closest to the geographic North Pole is a magnetic south pole. A compass needle points to the north because its north pole is attracted to a very large magnetic south pole.
Earth’s magnetic field plays a part in making auroras. An aurora is formed when charged particles from the sun hit oxygen and nitrogen atoms in the air. The atoms become excited and then give off light of many colors.
Earth’s magnetic field blocks most of the charged particles from the sun. But the field bends inward at the magnetic poles. As a result, the charged particles can crash into the atmosphere at and near the poles. Auroras seen near Earth’s North Pole are called the northern lights, or aurora borealis (aw RAWR uh BAWR ee AL is). Auroras seen near the South Pole are called the southern lights, or aurora australis (aw RAWR uh aw STRAY lis).