A new type of steel called ______ has been utilized for transformer cores.

• A. Amorphous
• B. Laminated steel
• C. Electrical steel
• D. Carbon steel

Answer: (A)

Minimizing core losses in transformer cores is the main idea. Core losses come from two sources: hysteresis losses as the magnetic domains realign with each reversal of the alternating field, and eddy current losses as circulating currents form in the metal. Amorphous steel improves both: its disordered atomic structure yields very low coercivity, so magnetization lags less (lower hysteresis loss), and its higher resistivity reduces eddy currents. Because of these properties, amorphous steel can produce lower core losses than conventional crystalline steels, making it attractive for transformer cores and explaining why it’s described as a newer material for this use. Traditional approaches like laminated steel reduce eddy currents by insulating sheets, and electrical steel is still crystalline silicon steel, while carbon steel has poorer magnetic properties.