# Title Image Description Video
1 LR Time Constant on Scope LR Circuits

A plug in circuit board with a make before break switch for showing slow RL time constants on the oscilloscope.

2 Series or Parallel Lamps w/Inductor LR Circuits Two lamps are used to indicate voltage across and current through a large electromagnet.  Do this with the iron core in and then with the iron core removed.

 

3 Induction Coil and Magnet Inducted Current and Forces Move the magnet in and out of the coil connected to the galvanometer. Video
4 Mutual Induction Coils with Battery Inducted Current and Forces Two coils face each other, one attached to a galvanometer, the other to a battery and tap switch.  Coupling can be increased with various cores.  Aluminum, laminated iron, and other solid iron cores are available.

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5 Pendulum in Big Electromagnet Eddy Currents

Show that a solid copper plate swings between the poles of the electromagnet when the power is off. Turn on the power. Displace the pendulum and let it swing. It stops dead between the poles. Repeat with the slotted plate, ring and slit ring. Cannot leave the power on.

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6 Magnets and Tubes Eddy Currents

Drop magnets simultaneously down the copper and stainless steel tube. It takes approximately 3 seconds for the magnet to fall through the three foot copper tube. Dummy magnets are also available.  Aluminum tubes will also show damping.

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7 Faraday Repulsion Coil Eddy Currents

A magnet is inserted and withdrawn from a solid and split ring on a bifilar suspension.  It is possible to "pump" the solid ring.

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8 Dissectible Transformer Transformers

Voltages can be shown on the primary and secondary coils of a dissectible transformer.

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9 Motor/ Generator Motors and Generators

Use the double throw switch to connect the battery to the motor. The 500 gram mass will rise. Switch to neutral and let the mass fall halfway down to build up speed. Switch to light bulb and bulb will light.

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10 Induction Coil Tesla Coil

Turn on the Tesla coil. Take the spectra tube and hold it within 2 feet of the Tesla coil. Vary the distance. Do the same thing with the fluorescent tube. Using the grounding wire on the end of the tube can help avoid unpleasant shocks.  Discuss shocks vs. burns and high frequency AC. 

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