1. Electromagnetism

2. Electromagnetism A moving charge creates a magnetic field
Electric current (I) is moving electrons, so a current-carrying wire creates a magnetic field

3. Electromagnetic Induction
Faraday’s Law
When the strength of a magnetic field through a loop of conductive wire changes, an electric current is induced in the wire
The induced current produces it’s own magnetic field

4. Electromagnetic Induction
Lenz’s Law
An induced electric current always flows in a direction to oppose the change in magnetic field
The amount of magnetic field inside a loop wants to remain constant

5. Electric Motors All electric motors are electromagnetic motors
Electric motors convert electrical energy into mechanical energy
Magnets within the motor interact with electric current to produce a force (and a torque)
F = I L × B
Electricity and magnetism are used to spin a coil, which does mechanical work