Get ready for bell work. 3-7-18

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World’s Strongest Magnet video

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Test Data (Add to your data page): Ch 13.4 and 14 CFA Add your data and fill in your graph for the Acids & Bases test.

Success Criteria: I can distinguish the earth’s magnetic field. I can distinguish the field that surrounds a: 1. magnet 2. electromagnet

Name two examples of the effect of Earth’s magnetic field. The Earth behaves as if it has a bar magnet running through its center. The point of a compass needle is attracted to the south pole of a magnet. Opposite poles of magnets attract each other. A compass needle points north because the magnetic pole of Earth that is closest to the geographic North Pole is a magnetic south pole. Scientists think that the Earth’s magnetic field is made by the movement of electric charges in the Earth’s core. 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.

Section 2: Electromagnetism—the interaction between electricity and magnetism. Solenoids and electromagnets. A solenoid is a coil of wire that produces a magnetic field when carrying an electric current. An electromagnet is made up of a solenoid wrapped around an iron core. Electromagnets are very useful because they can be turned on and off as needed. The solenoid has a field only when there is electric current in it.

Section 3: Michael Faraday conducted an experiment trying to get the magnetic field of the electromagnet to make an electric current in a second wire. Faraday realized that electric current in the second wire was made only when the magnetic field was changing. The process by which an electric current is made by changing a magnetic field is called electromagnetic induction. The electric current produced by the generator changes direction each time the coil makes a half turn. Because the electric current changes direction, it is an alternating current.

The energy that generators convert into electrical energy comes from different sources such as fossil fuels and nuclear energy. A transformer increases or decreases the voltage of alternating current. The number of loops in the primary and secondary coils of a transformer determines whether it increases or decreases the voltage. The electric current that brings electrical energy to your home is usually transformed three times.

Facts About Electricity Electric currents produce a magnetic field The direction of the field depends on the direction of the current It is a force caused by electric charge The two positive charges repel each other, as do the negatives Travels at the speed of light (186,000 mph)

Exit Ticket- Answer and justify with your different sibling partner.

Exit Ticket