Through this simple design, students can understand how an alternating current in the primary circuit creates a time-dependent magnetic field in the core, which, in turn, induces an alternating current in the secondary circuit, via Faraday’s law of electromagnetic induction. The respective voltages are in the same ratio as the numbers of turns. Thus, they can understand the basic difference between a step-up and step-down transformer.
It has one coil with 2400 turns. This is the mains coil, 230 to 240 Volts, 50 Hz
There are two interchangeable secondary coils, 65 turns coil and 130 turns coil, giving outputs of 6 and 12 Volts approximately at a maximum current of 2 A.
The laminated iron core is in two sections, ‘T’ and ‘U’ with butt joints.
A simple channel and wing-nut clamping arrangement facilitates quick assembly and interchange of coils.
The coils are wound on insulating bobbins, with a 2-pin connection for mains and a 4 mm socket for the secondary outputs.
The number of turns, voltage and amperage is marked on each coil.
The transformer is supplied complete with 2 m of flex and a 2-pin mains connector.