pyörrevirtauksissa

Pyörrevirtauksissa, also known as eddy currents, are electrical currents induced within a conductor by a changing magnetic field. This phenomenon is a direct consequence of Faraday's law of induction. When a conductor is placed in a time-varying magnetic field, the magnetic flux through the conductor changes. This change in flux induces an electromotive force (EMF), which in turn drives electric currents within the conductor. These induced currents circulate in closed loops, resembling eddies in a fluid, hence the name "pyörrevirtauksissa".

The magnitude of the induced pyörrevirtauksissa depends on several factors, including the strength of the magnetic field, the rate of change of the magnetic field, the resistivity of the conductor, and the geometry of the conductor. Materials with lower electrical resistance will experience larger pyörrevirtauksissa for a given change in magnetic flux.

Pyörrevirtauksissa have both beneficial and detrimental applications. In some cases, they are intentionally utilized, such as in induction cooktops where they heat cookware directly through resistive losses, or in eddy current brakes for vehicles where the induced currents create a magnetic drag force. However, pyörrevirtauksissa can also be a source of energy loss in electrical devices like transformers and electric motors, where they cause unwanted heating and reduce efficiency. To minimize these losses in such applications, core materials are often laminated, meaning they are made up of thin, insulated sheets, which increases the electrical resistance in the path of the circulating currents and thus reduces their magnitude.