Unit of inductance: Inductance is a scalar and its unit is Wb A-1 or V s A-1 . It is also measured in henry (H).
1 H = 1 Wb A-1 = 1 V s A-1
The dimensional formula of inductance is M L2 T-2 A-2.
If i = 1 A and NΦB = 1 Wb turns, then L = 1 H. Therefore, the inductance of the coil is said to be one henry if a current of 1 A produces unit flux linkage in the coil.
If \(\frac{di}{dl}\) = 1 AS-1 and ε = -1 V, then L = 1 H.
Therefore, the inductance of the coil is one henry if a current changing at the rate of 1 A s-1 induces an opposing emf of 1 V in it.
