14 Magnetism

Objectives

Section 1: Magnetism

• 1. Explain how a magnet exerts a force.

  2. Describe the properties of temporary and permanent magnets.

  3. Explain why some materials are magnetic and some are not.

  4. Model magnetic behavior using magnetic domains.

Section 2: Electricity and Magnetism

• 1. Describe the magnetic field produced by an electric current.

  2. Explain how an electromagnet porduces a magnetic field.

  3. Describe how electromagnets are used.

  4. Explain how an electric motor operates.

Section 3: Producing Electric Current

• 1. Define electromagnetic induction.

  2. Describe how a generator produces an electric current.

  3. Distinguish between alternating current and direct current.

  4. Explain how a transformer can change the voltage of an alternating current.