Electromagnetism

Objectives  SPI Recognize that electricity can be produced using a magnet and wire coil.  SPI Describe the basic principles of an electromagnet.  SPI Distinguish among the Earth’s magnetic field, a magnet, and the fields that surround a magnet and an electromagnet I Can: 1.Describe the basic principles of an electromagnet 2.Identify the relationship between an electric current and a magnetic field. 3.Distinguish among the Earth’s magnetic field, a magnet, and an electromagnet.

Properties of Magnets  Magnet: any material that attracts iron or materials containing iron. 1.Two magnetic poles: North and South 2.Magnetic force  Like poles repel, opposite poles attract  Strongest force at poles 3.Magnetic field: region in which magnetic forces act.

Earth as a Magnet

Electromagnetism  Interaction between electricity and magnetism  Components  Battery  Copper wire  Iron core  Solenoid: coil of wire  Make stronger by adding more loops in the solenoid.

Uses of Electromagnets  Doorbells  Electric Motors  Telephones

Generate Electricity  Produce stronger electric current by moving iron core through coil of wire.  Faster movement → greater current  Used  Generators  Transformers  Electrical power for your home