Growing up,Tesla studied at the Realschule, Karlstadt in 1873, the Polytechnic Institute in Graz, Austria and the University of Prague. Primarily he intended to apply oneself in physics and mathematics, nevertheless electricity caught his attentions, and being the apple of his eyes. His career as electrical engineer started with telephone company in Budapest, 1881. There he was, wandering with the company of his friend throughout the city park that the elusive solution to the rotating magnetic field flashed through his mind. With a stick, he point up a portray of a diagram in the loose granular substance put into words to his friend the principle of the induction motor. Prior to depart to America, Tesla joined Continental Edison Company in Paris where he designed dynamos. While in Strasbourg in 1883, he privately built a prototype of the induction motor and ran it successfully. Unable to hold one's attention in Europe in promoting this radical device, Tesla accepted an offer to work for Thomas Edison in New York.

Young Nikola Tesla stepped his feet to the home of Uncle Sam in 1884 with an introduction letter from Charles Batchelor to Thomas Edison: “I know two great men,” wrote Batchelor, “one is you and the other is this young man.” Tesla keep the company of the next 59 years living in New York. Tesla set about improving Edison’s line of dynamos while working in Edison’s lab in New Jersey. It was here that his divergence of opinion with Edison over direct current versus alternating current began. The huge disagreement climaxed in the war of the currents as Edison fought a losing battle to protect his investment in direct current equipment and facilities.

Tesla pointed out, the inefficiency of Edison’s direct current electrical powerhouses that have been build in the Atlantic seaboard. Je felt lay in the use of alternating current ,because to him all energies were cyclic. Why not build generators that would send electrical energy along distribution lines first one way, than another, in multiple waves using the polyphase principle?

Nikola Tesla then developed polyphase alternating current system of generators, motors and transformers and held 40 basic U.S. patents on the system, which George Westinghouse bought, determined to supply America with the Tesla system. Edison did not want to lose his empire, and a bitter war had been started. This was the war of the currents between AC and DC. Tesla -Westinghouse ultimately emerged the victor because AC was a superior technology. It was a war won for the progress of both America and the world. Tesla then take the lead into the introduction his motors and electrical systems in a classic paper, “A New System of Alternating Current Motors and Transformers” which he delivered before the American Institute of Electrical Engineers in 1888. One of the most impressed was the industrialist and inventor George Westinghouse. One day he visited Tesla’s laboratory and was amazed at what he saw. Tesla had constructed a model polyphase system consisting of an alternating current dynamo, step-up and step-down transformers and A.C. motor at the other end. The perfect partnership between Tesla and Westinghouse for the nationwide use of electricity in America had begun.

In February 1882, Tesla discovered the magnificent theory of rotating magnetic field, a fundamental principle in physics and the basis of nearly all devices that use alternating current. Tesla brilliantly adapted the principle of rotating magnetic field for the construction of alternating current induction motor and the polyphase system for the generation, transmission, distribution and use of electrical power.

Dilatar belakangi oleh kisah ini, karya dari XI-4 merepresentasikan kisah Santa Angela Merici saat pergi ke Roma pada tahun 1525. Karya XI-4 yang pertama adalah gambar bergaya mozaik yang menggambarkan saat Santa Angela bertemu dengan Paus, gaya mozaik digunakan untuk mengingatkan pelihat pada gaya yang biasa digunakan dalam jendela gereja. Kemudian, melalui hiasan kelas bernuansa Gereja, bersuasana gelap, dan ruang yang disediakan bagi pendatang untuk berefleksi, dapat mengajak pendatang untuk berefleksi tentang kisah dari Santa Angela yang menginspirasi kita sebagai siswa sekolah Ursulin. Terima Kasih kepada pembaca karena sudah menyempatkan diri untuk membaca kisah Santa Angela dari karya XI-4.