eddy currents

Question

Eddy currents are?

RankGuru · Accepted Answer

1. **Origin**: When a solid sheet or bulk piece of conductor is placed in a changing magnetic flux, emf is induced throughout the volume.
2. **Flow**: Unlike wires, the current flows in closed circulating paths (like eddies in water) within the body of the conductor.
3. **Effects**: 
   - **Heating**: Causes significant energy loss (Joule heating).
   - **Damping**: Produces a braking effect by Lenz's Law (used in electromagnetic brakes).
4. **Reduction**: Minimized by using **laminated cores** in transformers and motors to break the large current loops into smaller, high-resistance paths.

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Eddy currents are induced circulating currents leading to: