Henry (unit)

Definition

The inductance of an electric circuit is one henry when an electric current that is changing at one ampere per second results in an electromotive force of one volt across the inductor: $V (t) = L \frac{d I}{d t},$ where V(t) is the resulting voltage across the circuit, I(t) is the current through the circuit, and L is the inductance of the circuit.

The henry is a derived unit based on four of the seven base units of the International System of Units: kilogram (kg), metre (m), second (s), and ampere (A). Expressed in combinations of SI units, the henry is: $\begin{matrix} H & = \frac{k g \cdot m^{2}}{s^{2} \cdot A^{2}} & = \frac{N \cdot m}{A^{2}} & = \frac{J}{A^{2}} & = \frac{k g \cdot m^{2}}{C^{2}} & = \frac{s^{2}}{F} \\ = \frac{T \cdot m^{2}}{A} & = \frac{W b}{A} & = \frac{V \cdot s}{A} & = \frac{Ω}{r a d \cdot H z} & = \frac{Ω \cdot s}{r a d} & = Ω \cdot s \end{matrix}$ where: H = henry, kg = kilogram, m = metre, s = second, A = ampere, N = newton, C = coulomb, J = joule, T = tesla, Wb = weber, V = volt, F = farad, Ω = ohm, Hz = hertz, rad = radian (dimensionless quantity)

2 more chapters are free with a Lably account.

Definition

Use

Applications

More in Basics and measurement