Presentation on theme: "How are these guys related to electricity?. Magnetism Unit Vocabulary 1. Magnet- Definition- Materials that attract iron or contain iron. Sentence- I."— Presentation transcript:
Magnetism Unit Vocabulary 1. Magnet- Definition- Materials that attract iron or contain iron. Sentence- I used a magnet to pick up a nail. 2. Magnetic Fields 3. Electromagnets 4. Solenoid 5. Generator 6. Motor
Properties of Magnets- Activity 1 Using the paperclips at your station, try to find out where the magnet is strongest: North Pole, South Pole, or in the middle.
Properties of Magnets- Activity 2 Place the North and South poles in the positions you see them in here. What happened? Why?
I don’t get it. How does a magnet work? Magnets work by causing electrons to move and this movement creates a magnetic field and electricity. In iron, nickel, and cobalt, the atoms group together (domains) and line up by poles. Most materials, the magnetic fields of individual atoms cancel each other out.
Properties of Magnets Two poles (strongest part) NSNS
Properties of Magnetst Exert forces ○ Can push or pull N S movement
Properties of Magnets Surrounded by a magnetic field ○ A magnetic field is the area around the magnet where magnetic forces act.
Properties of Magnets Magnetic fields can produce electrical current in conductors. Opposite is true too. Electricity can produce a magnetic field.
Compare w/ Electricity (Very Similar) Opposites attract/ like repels. Both depend on electrons. Moving electrons (current) produce magnetic fields, so electricity can generate a magnetic field. A magnetic field can generate an electric current.
Poles on a Compass- Activity 4 Which pole of the magnet do you think the compass will point to? Place your compass on the bar magnet. Which pole did it point to? Why? How does a compass work?
Electromagnets are TEMPORARY! http://en.wikipedia.org/wiki/File:Electromagnet.gif
Electromagnets Temporary Lose magnetism when electric current ( I ) is removed. Contain 3 parts (usually): Iron core (can you make it without this? Activity 4) Solenoid (coiled wire that produces a magnetic field when current runs through it) ○ More coils means what? Source ○ More volts means what?
Oersted’s Experiment- Activity 5 Turn to p. 462 and try to duplicate the Oersted’s experiment in Figure 13 a, b, and c. Check with me after each one.
Magnetic Force & Electric Current Activity 6- See if you can duplicate the force exerted on the wire when current goes a runnin. Reference p.465 Figure 16 a & b.
Generators & Motors Generators: A device that converts mechanical energy into electrical energy. Most of the electrical energy we use comes from generators. Motors: A device that converts electrical energy into mechanical energy that is used to do work. Examples – blenders and washing machines