the.com/inductance
a coil's stubborn refusal to let current change its mind quickly.
means The property of an electrical conductor by which a change in current induces a voltage that opposes that change, measured in henries.
from From the Latin 'inducere,' to lead in (in- 'into' + 'ducere' to lead) — the same root that gives us 'induce' and 'conduct.' The electrical sense grew up in the 19th century alongside the discovery of electromagnetic induction; the noun 'inductance' itself is a later formation, stitching the physics of 'induct' onto the abstract '-ance' ending. The unit, the henry, honors Joseph Henry, an American physicist who studied the effect.
- unit
- measured in henries, named after Joseph Henry
- hidden inertia
- current behaves like it has mass
- stores energy
- holds power in an invisible magnetic field
- spark danger
- breaking the circuit can throw violent voltage spikes
- everywhere
- even a straight wire has tiny inductance
henry coil — si unit named after joseph henry; 1 henry = 1 weber per ampere, standard in electromagnetic physics
tesla coil — nikola tesla's invention producing high voltage resonant oscillations; demonstrated wireless power transmission in 1891
ferrite toroid — ring-shaped inductor with ferrite core used in power supplies; common in every switched-mode power supply since the 1970s