Magnetism Section 3 Electromagnetic Induction What happens when

Magnetism Section 3 Electromagnetic Induction 〉 What happens when a magnet is moved into or out of a coil of wire? 〉 Moving a magnet into and out of a coil of wire causes charges in the wire to move. • electromagnetic induction: the process of creating a current in a circuit by changing a magnetic field • Faraday’s law states: An electric current can be produced in a circuit by a changing magnetic field crossing the circuit.

Magnetism Section 3 Electromagnetic Induction, continued

Magnetism Section 3 Electromagnetic Induction, continued • Electromagnetic induction obeys conservation of energy. – Pushing a loop through a magnetic field requires work. • As the loop moves in and out of the magnetic field of the magnet, a current is induced in the circuit. • Rotating the circuit or changing the strength of the magnetic field will also induce a current in the circuit.

Magnetism Section 3 Electromagnetic Induction, continued

Magnetism Section 3 Electromagnetic Induction, continued • Generators convert mechanical energy into electrical energy. • generator: a machine that converts mechanical energy to electrical energy • alternating current (AC): an electric current that changes direction at regular intervals – For each half rotation of the loop, the current produced by the generator reverses direction. • AC generators produce the electrical energy you use in your home.

Magnetism AC Generator Section 3

Magnetism Section 3 The Electromagnetic Force 〉 How are electricity and magnetism related? 〉 Electricity and magnetism are two aspects of a single force, the electromagnetic force. • The energy that results from these two forces is called electromagnetic (EM) energy. • Light is a form of electromagnetic energy. • EM waves are made up of oscillating electric and magnetic fields that are perpendicular to each other.