What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage:

• A. Eddy Current and Hysteresis losses will be excessive
• B. Current will be too much high
• C. No effect
• D. Transformer may start to smoke and burn

Answer: (A)

Core loss of transformer = Hysteresis loss + eddy current loss
Hysteresis loss prpotional to f
eddy current loss prpotional to f².