What is the Difference Between Eddy Current and Induced Current?

Eddy current and induced current are two different concepts in electromagnetism. Here are the main differences between them:

1. Definition: Eddy currents refer to loops of currents induced within large bodies of conductors, as a result of a changing magnetic field across it. Induced currents are typically found in coils connected to a closed circuit and are created through electromagnetic induction.
2. Formation: Eddy currents are generated within the material, while induced currents are created within a closed circuit.
3. Area of the Conductor: Eddy currents are independent of the area of the conductor, but induced currents are dependent on the area covered by the circuit.
4. Usefulness: Induced currents, such as those in transformers, are useful in various applications. Eddy currents, on the other hand, are generally considered undesirable as they dissipate energy in the form of heat. However, they have some practical applications, such as magnetic levitation, identification of metals, position sensing, electromagnetic braking, and structural testing.

In summary, eddy currents are loops of currents generated within a conductor due to electromagnetic induction, while induced currents are created within a closed circuit and are strictly dependent on the area covered by the circuit. Eddy currents are usually undesirable, as they waste energy, while induced currents have numerous practical applications, such as transformers and induction cookers.

Comparative Table: Eddy Current vs Induced Current

Here is a table comparing the differences between eddy current and induced current:

In summary, while both eddy currents and induced currents are related to electromagnetic induction, they differ in their dependence on conductor area, applications, and energy loss. Eddy currents are circular currents induced in conductors exposed to changing magnetic fields, while induced currents are the result of electromagnetic induction in a conductor. Eddy currents are independent of the area of the conductor, whereas induced currents depend on the area covered by the circuit.