Transformers Concept

Demonstrations in Transformers

Two demountable transformers on metal stands connected by wet strings draped between them, with coils on wooden bases and an illuminated light bulb on the right; chalkboard with generator equations behind
Safety

Wet String Transmission Line

Demonstrates why power lines use high voltage. Transformers step 110V up to ~4800V to transmit power through high-resistance wet strings, then step back down to light a bulb. Direct connection …
Assorted small inductors and transformers on green surface: toroidal coils, cylindrical inductors, E-core transformer, basket-weave coils, small circuit board, and various other components

Coils and Transformers

A collection of small commercial inductors and transformers for show-and-tell. Includes anti-theft stickers, projector circuit board, toroidal cores at various winding stages, basket-weave coils, and transformers with adjustable cores. Use …
Assembled dissectable transformer on wooden base: black iron core frame with two white Leybold 983 coil units mounted side by side, illuminated round light bulb on left, power strip below
Safety

Dissectable Transformer

Demonstrates transformer action using a dissectable iron core and two 250-turn coils. Students see that a light bulb glows at full brightness through electromagnetic induction alone — no direct electrical …
Demountable transformer on wooden base with 250-turn primary coil (left) and 5-turn copper helix secondary coil, connected to wooden-handled nails producing bright sparks at contact
Safety

Nail Melter / Spot Welder

A step-down transformer with a 250:5 turns ratio produces extremely high current at low voltage. Squeezing nails together produces dramatic sparking and incandescent heating, vividly demonstrating dissipation and the inverse …
Demountable transformer on wooden base with copper 250-turn coil on left side, iron ring with wooden handle mounted on right side, yellow power cord, and white enamel tray positioned beside it
Safety

Induction Heating

A 250-turn coil induces current in a lead wire loop seated in an iron ring, melting the lead in ~30 seconds through heating. Dramatically demonstrates power transfer via electromagnetic induction …
Jacob's ladder with two metal rods inside a tall cylindrical glass tube, mounted on a black acrylic platform over a clear box housing the transformer
Safety

Jacob's Ladder

Demonstrates high-voltage electrical breakdown and plasma formation. Students observe arcs forming where the electric field exceeds air's dielectric strength, then rising due to thermal convection.