electromagnets
Current-powered metal pullers
Electromagnets are magnets created by running electric current through a coil of wire, usually wrapped around an iron core.
Unlike permanent magnets, they can be switched on and off and their strength adjusted by varying the current.
They power electric motors, generators, MRI machines, and scrapyard cranes that lift cars.
The junkyard crane uses a powerful electromagnet to move metal.
Wound circular arrangement
- coreCentral essential portion
- windingCurving repeatedly, sinuous
- wireThin metallic conductor
- solenoidCurrent-carrying wire helix
armature · pole · iron core · copper wire · insulation · terminals · bobbin · laminations
Continuous change or flow
- inductanceElectromagnetic inertia of circuits
- currentDirected flow of charge
- polarityState of opposing forces
- attractionPull toward something
repulsion · permeability · saturation · hysteresis · gauss · tesla · eddy currents · reluctance
Lifting machines or birds
- scrapyardSalvage lot for vehicles
- MRIMagnetic body imaging
- maglevTrackless-seeming rail technology
- speakersAudio output devices
relays · motors · generators · particle accelerators · doorbells · circuit breakers · salvage · junkyard
Changing from one to another
- energizingImparting renewed vitality
- demagnetizingRemoving magnetic charge
- on-offHaving two states only
- power supplyElectrical energy delivery device
voltage · resistance · activation · pulse · duty cycle · remote operation
coil
Wound circular arrangement
solenoid · armature · pole · iron core · copper wire · insulation · terminals · bobbin · laminations · housing
flux
Continuous change or flow
- inductanceElectromagnetic inertia of circuits
- currentDirected flow of charge
- polarityState of opposing forces
attraction · repulsion · permeability · saturation · hysteresis · gauss · tesla · eddy currents · reluctance · magnetization
cranes
Lifting machines or birds
speakers · relays · motors · generators · particle accelerators · doorbells · circuit breakers · salvage · junkyard · separators
switching
Changing from one to another
- energizingImparting renewed vitality
- demagnetizingRemoving magnetic charge
- on-offHaving two states only
power supply · voltage · resistance · activation · pulse · duty cycle · remote operation
- magnetslodestones, lodestone, magnetite, ferromagnet
- electromagnetismelectric current, current, electric charge, electric fields, electric field
- magnetismferromagnetism, magnetization, demagnetize, poles, flux
- Science Museumdemonstrations, interactive displays, science museums, pendulums, prisms
- technologycomputing, computer, internet, social media, computers
- telegraphytelegraph, Morse code, telegraphy, telegraph key, telegraph line
electromagnetspermanent magnets
Self-sustaining magnetic materials
lodestones · neodymium magnets · rare earth magnets · bar magnets · magnetite
- electromagnetic wavesSelf-propagating field oscillations
- electromagnetic inductionVoltage from field changes
- electromagnetic pulseEnergy burst disabling electronics
- electromagnetic fieldForce region from charges
- electromagnetic radiationWave-propagating energy through space
- electromagnetic spectrumAll radiation frequencies ordered
electromagnet, electromagnetism, electromagnetic, electromagnetics