Working of a Transformer

Simple way to demonstrate that how a transformer works as an step up and step down stages. On applying alterting voltage across one coil then output voltage is generate across another coil due to mutual induction of magnetic coil. Coil 140turns/5 tapping 2 U and I core 1 Step down AC power supply 2-12V 1 Two way switch double pole 1 Rheostat 10?/ 8.5A 1 Digital Multi-meter 3 Connecting Cords 50cm (Black) Connecting Cords 50cm (Red) 5 Connecting Cords 100cm 1