Electromagnet Coil with Iron Core, Variac, and Coil with Light
Electromagnet Coil with Iron Core, Variac, and Coil with Light

 

Code Number: 5K30.30

Demo Title: Transformer - Coil and Light Bulb

Condition: Excellent

Principle: Induced Currents Due to AC

Area of Study: Electricity & Magnetism

Equipment: 

Electromagnet Coil with Iron Core, Variac, and Coil with Light.

Procedure:

Connect the Variac to the induction coil and insert the iron core. Turn the Variac to about 20 to 40 and the light bulb will light up when placed over it.

References:

  • John W. Jewett Jr., "Get the LED Out", TPT, Vol. 29, #8, Nov. 1991, p. 530.
  • C. L. Hamilton, J. H. Hamilton, D. A. Burba, and E. A. Jones, "Some Electrical Demonstration Using a Strong Permanent Magnet", TPT, Vol. 25, #4, Apr. 1987, p. 223.
  • Joe L. Ferguson, "Turn-By-Turn Transformer Demonstration", TPT, Vol. 17, #1, Jan. 1979, p. 59, also A Potpourri of Physics Teaching Ideas - Electricity and Magnetism, p. 151.
  • "B-425. Light under Water", DICK and Rae Physics Demo Notebook, 1993.
  • "B-260. Ring - Jumping and Heating", DICK and RAE Physics Demo Notebook, 1993.
  • David Kutliroff, "96, Extending the Lenz's Law Demonstration to Illustrate Inductance", 101 Classroom Demonstrations and Experiment For Teaching Physics, p. 211.
  • Robert Ehrlich, "N.1. Bringing a Coil with a Bulb near an AC-powered Coil", Turning the World Inside Out and 174 Other Simple Physics Demonstrations, p. 164.
University of Maryland Physics Department QOTW Question #182
University of Maryland Physics Department QOTW Answer #182
Video Credit: Jonathan M. Sullivan-Wood.
5K30.30 - Transformer - Coil and Light Bulb
5K30.30 - Dr. James Wetzel, PHYS 1611 - Transformer - Wireless Transmission
5K30.30 - University of Maryland QOTW #182