On applying alternating voltage across one coil then output voltage is generate across another coil due to mutual induction of magnetic coil.

U and I core                                                1

Step down AC power supply 2-12V          1

Two way switch double pole                     1

Rheostat 10Ω/ 8.5A                                   1

Digital Multi-meter                                    3

Connecting Cords 50cm (Black)               6

Connecting Cords 50cm (Red)                 5

Connecting Cords 100cm                         1