Electromagnetism

Objectives SPI 0807.12.1 Recognize that electricity can be produced using a

magnet and wire coil. SPI 0807.12.2 Describe the basic principles of an electromagnet. SPI 0807.12.3 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