Quick Answer: The Step Down Transformer Model is an open demonstration transformer with a laminated silicon steel U and I core and two detachable copper coils. Low-voltage AC up to 12V on the high-turn primary gives a lower voltage on the secondary.
Last updated: October 2026
Key Features
Laminated silicon steel U and I core held by thumb-screw clamps
Primary coil with a high turn count and secondary coil with fewer turns
Secondary coil with midway tapping points
Colour-coded 4mm insulated terminals
Wiring diagram and turn counts printed on the insulated base
About 200 mm x 140 mm x 110 mm
Technical Specifications
Specification
Value
Core
Laminated silicon steel, U and I, thumb-screw clamps
Primary coil
Insulated copper wire, high turn count
Secondary coil
Insulated copper wire, multi-tap
Maximum input
12V AC
Terminals
Colour-coded 4mm insulated
Dimensions (L x W x H)
Approx. 200 mm x 140 mm x 110 mm
About This Product
Because the coils and core are exposed, students can see how a transformer is built, take it apart and reassemble it. Measuring input and output voltages, and comparing the secondary taps, lets them check the turns-ratio relationship and see that the changing flux in the core is what induces the lower voltage.
Frequently Asked Questions
What power supply should be used with the Step Down Transformer Model?
A low-voltage AC bench supply of up to 12V AC. The open model must never be connected directly to mains.
Why is the core laminated?
Laminations reduce eddy current losses in the core.
