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The henry (symbol H) is the SI unit of inductance. If the rate of change of current in a circuit is one ampere per second and the resulting electromotive force is one volt, then the inductance of the circuit is one henry.

The henry has dimensions V·A^-1·s = m²·kg·s^-2·A^-2 in SI units.

The unit is named after the American scientist Joseph Henry.

SI electricity units

SI electricity units [ }\|action=edit}} Edit }]
SI Base unit
Name	Symbol	Quantity	Notes
ampere	A	Current
SI Derived units
Name	Symbol	Quantity	Notes
volt	V	Potential difference
ohm	Ω	Resistance, Impedance, Reactance
farad	F	Capacitance
henry	H	Inductance
siemens	S	Conductance, Admittance, Susceptance	=Ω⁻¹
coulomb	C	Electric charge
ohm · metre	Ω · m	Resistivity
siemens per metre	S / m	Conductivity
henry per metre	H /m	Permeability	μ
farad per metre	F / m	Permittivity	ε
reciprocal farad	F⁻¹	Elastance	=F⁻¹

SI derived units Units of electrical inductance

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