Definition
The unit of measurement for inductance in an electrical circuit. One henry is the amount of inductance present when a current changing at one ampere per second induces one volt across the inductor.
Plain English
The henry is how we measure a coil's ability to resist changes in current. The bigger the number of henries, the stronger that resistance to change.
Context Anchor
Seen in aircraft electrical-system study, especially when discussing coils, relays, generators, motors, transformers, and ignition components.
Derivation
Named after Joseph Henry, the American scientist who discovered electromagnetic induction in the 1830s. Knowing it's a person's name explains why it's capitalized and why it doesn't follow any obvious word root.
Why Pilots Care
Pilots do not usually calculate Henry values in flight, but understanding the term helps when reading maintenance explanations about aircraft electrical components that depend on magnetic effects.
Grounding Statement
A higher Henry value means the circuit has a stronger tendency to slow down changes in current.
Intuition Check
Henry does not mean a person's name in this context. Here it means a unit used to measure inductance in an electrical circuit.
Example Sentence 1
The inductor in the circuit was rated at 0.5 henries.
Example Sentence 2
Avionics troubleshooting often includes verifying inductor values in henries to confirm circuit stability.