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Eddy currents are, in general, stray currents of electricity that are created (by induction) in conductors. Any time a magnetic field "sweeps" or "moves across" a conductor, induction occurs, and tiny voltages (with their tiny currents) are set up. These currents, in turn, create small magnetic fields that oppose the magnetic field that induced the eddy currents in the first place. Said another way, any time a voltage is induced in a conductor, eddy currents flow and counter-electromotive force (counter emf or back emf) is induced which opposes the original field. We sometimes have a little narrower view of things in electronics. In many applications, eddy currents are tiny currents in things where we don't want them and can do something to minimize them. In a transformer, the primary windings induce voltage in the secondary winding. The expanding and contracting magnetic field of the primary windings is said to "sweep" the secondary windings, and induction will occur. Voltage will appear in the secondary windings. We often wind our Transformers around cores of ferromagnetic material. This material "conducts" magnetic lines of force and makes our transformer much more efficient. But the the magnetic field that sweeps the secondary also sweeps the core, and it induces voltage there, too. (Even though we don't want it to.) The voltage induced in the core causes some small amounts of current flow, and these small currents are called eddy currents. Transformers often use laminated iron for core material. Or they will used what appears to be powdered iron grains that are tightly compressed and stuck together. Both these tactics are designed to provide some insulation between pieces of material in the core, and this will considerably reduce eddy currents. Need a link to the Wikipedia article on eddy currents? You got it.
What else can I help you with?
What happens to the currents in a circuit?
a cell pushes electric currents around a circuit.If there are two or more cells then more currents will flow through them.
What are the swirling currents called that are induced in transformers and produce heat losses?
Eddy currents
Why electricity does not flow through iron core of transformer?
It does. We call this current, or currents, 'eddy currents', and they are minimised by using laminated cores.
What is the term given to to the point where two opposite electrical currents meet?
node Any number of currents can meet at a node, not just two.
An increase in wind causes this current to increase What type of current is it?
Convection is the process that causes warm air to rise and cold air to sink. As such, the winds caused by this process are called convection currents.
How do deep currents affect oceans?
eddie cuthy catch ca
Are thermohaline currents surface or deep water currents?
deepwater currents
What are diverging currents?
Diverging currents are currents that are deviating and usually take place to ocean currents. This will be marked by an inconsistent airflow pattern of the currents.
What are circular currents called?
If you are referring to currents in iron cores, circular currents are called eddy currents.
Are density currents faster than surface currents?
no, density currents flow slower than surface currents because surface currents are powered by the wind ;)
What are the three types of ocean currents?
The three types of ocean currents are surface currents, deep currents, and tidal currents. Surface currents are driven by winds, deep currents are driven by density and temperature differences, and tidal currents are driven by the gravitational pull of the moon and sun.
What nicknames does Eddie Guardado go by?
Eddie Mariano goes by Matrix, Fast Eddie, and Eddie Matrix.
How do currents affect?
Warm currents have a very obvious affect on the temperature that surrounds it. Warm currents will warm the area around the currents.
How are deep ocean currents form?
Cold ocean currents sink under warm ocean currents to form deep ocean currents.
What are the basic 2 types currents?
You can have electrical currents, or currents in fluids such as water or air.
Describe the similarities and differences between gyres and currents?
A difference between gyres and currents is that currents are formed by the wind, but gyres are formed by currents.
How do currents affect temperature?
Warm currents have a very obvious affect on the temperature that surrounds it. Warm currents will warm the area around the currents.
