Plural form of 'henry,' a unit of electrical inductance named after scientist Joseph Henry.
The henry (symbol H) was named in honor of American physicist Joseph Henry (1797-1878) and his discoveries in electromagnetism. The plural follows standard English rules for metric units.
The henry is a massive unit—one henry is so large that practically useful inductances are measured in millihenries or microhenries! It's like naming the basic unit after someone when the actual practical unit would need tiny fractions of it.
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