the.com/solenoid
a coil of wire pretending it's a magnet only when electricity says so
means A coil of wire that becomes a magnet when an electric current flows through it, often used to convert that current into mechanical motion, like flicking a bolt or valve.
from From Greek 'sōlēn' (a pipe, channel, or tube) plus '-oid' (resembling, from 'eidos,' form) — literally 'tube-like,' a nod to the hollow cylindrical shape of the wound coil. The term was coined in the 19th century by the French physicist André-Marie Ampère, an early mapper of how electricity and magnetism are entangled.
- on demand
- Current makes the magnetic field; cut it, field vanishes
- car starter
- Clicks your engine to life every cold morning
- field inside
- Magnetic field stays nearly uniform along its core
- named 1820s
- From Greek for channel-shaped, coined by André-Marie Ampère
- valve duty
- Controls washing machine water and sprinkler flow electrically
large hadron collider magnets — 8.3 tesla solenoids bend 7 tev protons at cern near geneva
mri machine magnets — 1.5-3 tesla superconducting solenoids image human bodies in hospitals worldwide
starter motor solenoid — 12v electromagnetic switch engages engine cranking in virtually all cars since 1960s