# How are these guys related to electricity?. Magnetism Unit Vocabulary 1. Magnet- Definition- Materials that attract iron or contain iron. Sentence- I.

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How are these guys related to electricity?

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

BrainPop 1 – Magnetism  video video

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.

What materials are magnetic?

Types of Magnets  Ferromagnets  Electromagnets  Temporary magnets  Permanent magnets

What is the largest magnet you have ever seen?

BrainPop 2 - compass  video video

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?

BrainPop 3

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?

BrainPop 4

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

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