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Code Number: 5E50.30
Demo Title: Thermoelectric Magnet
Condition: Good
Principle: Thermocouple and Electromagnets
Area of Study: Thermoelectricity
Equipment:
Thermoelectric loop, electromagnet iron core with plate, liquid nitrogen, Bunsen burner or propane torch, masses.
Procedure:
NOTE: This demo will take about 10 minutes to do with the propane torch running the whole time and making noise. To minimize the time you can hang paper clips from the magnet instead of waiting for it to be able to attract and hold the 500 gram plate.
Secure the loop into the iron core with the set screws. Place one end of the loop into liquid nitrogen for a few minutes. Then, heat the other end with the propane torch. After several minutes the electromagnet should be working well enough to attach the plate and then hang a 1 kg mass off of it.
The following table gives the elements in the thermoelectric series in order:
- Silicon
- Bismuth
- Nickel
- Cobalt
- Palladium
- Platinum
- Uranium
- Copper
- Manganese
- Titanium
- Mercury
- Lead
- Tin
- Chromium
- Molybdenum
- Rhodinium
- Iridium
- Gold
- Silver
- Aluminium
- Zinc
- Tungsten
- Cadmium
- Iron
- Arsenic
- Tellurium
- Germanium
Taken from The Thermoelectric Series
References:
- E - 340: "Thermoelec. Magnet & Solar Cubs", DICK and RAE Physics Demo Notebook.
- H-374: "Thermocouple Magnet - Seebeck", DICK and RAE Physics Demo Notebook.
- Stanislaw Bednarek, "Thermoelectric Motor", AJP, Vol. 63, #11, Nov. 1995, p. 1051.
- Adolf Cortel, "Thermoelectric Generators", Physics Education, Vol. 42, # 1, Jan. 2007.
- R. W. Pohl, "Metals as Conductors of the First Class. Thermo-electric Pressures", Physical Principles of Electricity and Magnetism, p. 268.
- Various e-mail correspondence with Adolf Cortel.