### Basic Principles

• Magnetman Visit this site to learn all about magnets. This guy loves magnets even more than I do! Lots of information and experiements here... make sure you follow the "next" links.
• Magnetic field lines.Visualize magnetic field lines, by showing the effect of a bar magnet on iron filings.
• Electric and Magnetic Fields Incredible Java applets to manipulate electric and magnetic fields. Includes a great one showing the rotating magnetic field in an induction motor. If you go up a level, there are a lot of other power electronics simulations.
• Lenz's Law. Shows the relationships between induced magnetic fields, voltage, and current when a conductor is passed within the lines of force of a magnetic field.
• Faraday's Experiment Illustrates Faraday's famous experiment with a moving magnet and a coil of wire.
• Electromagnetic induction Shows how a changing magnetic field can induce a voltage in another coil. Also show how a changing current creates a magnetic field.
• Capacators Shows charging and discharging of a capacitor.
• AC Circuit Principles A site using animations to explain AC circuits, impedance, phase relations, resonance and RMS quantities.

### Phasors

• Phasor diagrams Animated gif showing relationship between phasor and sin() wave. Also leading and lagging waves, and addition of phasors.
• Phasor Game A "game" to match the phasor to the corresponding sin wave.

### Transformers

• Transformer University Everything you should know about transformers, and more, here. Be sure to read the transformer basics chapter.
• Transformer simulaton. Allows you to visualize the relation between primary and secondary voltage as the turns ratio is changed.
• Transformer Connections.Nice illustrated discussion of transformer connections.

### Motors and Generators

• AC Generator Action. Shows how a rotating coil immersed in a field produces an AC voltage. Also shows use of slip rings and the relation between RPM and frequency.
• DC Generator Action. Similar to the AC generator, but using a commutator rather than slip rings.
• Squirrel Cage Motor.Animated GIF which attempts to show what is going on in a squirrel cage rotor.
• Squirrel Cage Motors.Excellent website with lots of detailed information about squirrel cage motor principles.
• Electric MachinesWebsite supposedly has movies showing fields in motion, but I can't seem to make them play on my machine. Uses Windows Media Player.
• Rotating Magnetic FieldThe rotating field in a three-phase motor is illustrated here, along with a similar animation showing what happens if the motor is single phased.
• Youtube video of an induction motor being built.
• Good video explaining the how a rotating magnetic field is developed.