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Taman Siswa (English: Garden of Pupils) was a Javanese educational movement and school system founded by Ki Hadjar Dewantara in 1922. It began by founding a kindergarten (Taman Idria) and then through adding schools at various levels it established a University ( Universitas Sarjanawiyata Tamansiswa ) in 1959.
These systems can be used to convert three-phase 50 Hz or 60 Hz alternating current (AC) for the supply of AC railway electrification systems at a lower frequency and single phase, as used by many older systems, or to rectify AC into direct current (DC) for those systems (primarily public transit systems) using DC for traction power.
In electrical engineering, a transformer is a passive component that transfers electrical energy from one electrical circuit to another circuit, or multiple circuits.A varying current in any coil of the transformer produces a varying magnetic flux in the transformer's core, which induces a varying electromotive force (EMF) across any other coils wound around the same core.