Are Iron losses also known as no-load losses because they occur when the customer is disconnected from the transformer

• A. Yes
• B. No
• C. Sometimes
• D. Never

Answer: (A)

Iron losses are the losses in the transformer core due to hysteresis and eddy currents in the magnetic material. These losses occur whenever there is magnetic flux in the core, which happens as soon as the primary is energized, even if no load is connected to the secondary. In a no-load condition, the secondary is open, and the only current drawn from the source is the magnetizing current that establishes that flux. The energy lost in the core under this condition is what we call no-load losses, and iron losses are the primary component of those. Copper losses, by contrast, depend on current in the windings and thus on load. So yes, iron losses are known as no-load losses because they persist when the secondary is disconnected.