Induction Related Devices

Generators: A generator is nothing more than the reverse (symmetry) of an electric motor. A motor, you put current into it and you get mechanical work out of it. A generator, you put mechanical work into it and you get current out.

Microphone: A simple microphone is the reverse (symmetry) of a speaker. A speaker, you put alternating current into it and you get sound out. A microphone, you put sound into and you get alternating current out

Tesla Coils: A Tesla coil is a device that creates high voltage, high frequency electricity. There are hundreds of websites related to building Tesla Coils. Tesla Coil background and info.
Great images of giant Tesla Coils in NY.

Transformers: A transformer uses the changing current in a primary coil of wire to create a changing magnetic field. This changing magnetic field causes an alternating current to be induced in the secondary coil of wire. A transformer and alternating current allow voltages to be either stepped down (decreased) or stepped up (increased).

Magneto: A Magneto is used in a small gas engine to create a voltage large enough to create a spark. This spark causes the engine to run. The magneto uses induction (sometimes twice) to create this spark.
Jacob's Ladder.: A Jacob's ladder is often seen in old science fiction movies serves little purpose. Typically, an induction coil is used to create high voltage and high frequency electricity, which then will jump the gap between two wires.

Š1999 Science Joy Wagon