the.com/eddy current
A magnet moving near metal makes the metal fight back, out of pure laziness.
means A loop of electric current induced inside a conductor by a changing magnetic field, which in turn creates its own magnetic field that opposes the change — nature's version of dragging its feet.
from 'Eddy' comes from the old word for a swirling current of water or air that circles back against the main flow — related to Old Norse 'iða,' meaning whirlpool. Scientists in the 1800s, studying induction, borrowed the image: just as a river eddy spins backward against the current, these looping electric currents swirl inside metal and push back against the magnetic change that spawned them.
- brake magic
- Powers brakes on roller coasters, no contact needed
- named after
- Swirls, like water eddies, not a person
- energy cost
- Wastes power as heat in transformers
- metal detector
- Finds buried coins by disturbing their currents