What term describes current losses caused by circulating currents in a magnetic core that produce heating and alter current distribution?

What term describes current losses caused by circulating currents in a magnetic core that produce heating and alter current distribution?

• A. Counter EMF
• B. Eddy Current
• C. Transformer Theory of Operation
• D. Uses of Multiple Capacitors

Answer: (B)

Eddy currents are circulating currents induced in a conductor or magnetic core by a changing magnetic field. In a transformer core, the alternating flux from the windings drives these loops in the iron, and the circulating currents dissipate energy as heat (I^2R losses). They also affect how current and magnetic flux are distributed in the core and windings. Laminating the core or using high-resistivity materials limits these loops, reducing heat and improving efficiency—especially important at the aircraft’s 400 Hz operation. The other terms don’t describe this phenomenon: Counter EMF is the back-EMF opposing current in inductors, the transformer theory of operation is a general energy-transfer concept, and uses of multiple capacitors are unrelated.

Eddy currents are circulating currents induced in a conductor or magnetic core by a changing magnetic field. In a transformer core, the alternating flux from the windings drives these loops in the iron, and the circulating currents dissipate energy as heat (I^2R losses). They also affect how current and magnetic flux are distributed in the core and windings. Laminating the core or using high-resistivity materials limits these loops, reducing heat and improving efficiency—especially important at the aircraft’s 400 Hz operation. The other terms don’t describe this phenomenon: Counter EMF is the back-EMF opposing current in inductors, the transformer theory of operation is a general energy-transfer concept, and uses of multiple capacitors are unrelated.