Eddy Currents
Loops of electric current induced within solid bulk conductors by a changing magnetic field according to Faraday's law.
Governing formula
P_eddy ∝ f² B_max² t²
SI unit
W (Watts)
In depth
Eddy currents create opposing magnetic fields (Lenz's law) and dissipate heat (I² R). They are minimized in transformer cores by using insulated, laminated iron sheets.
Examples in the real world
Induction cooktops heating cookware via eddy currents, or smooth magnetic braking systems on high-speed trains and roller coasters.