# Inductance

A circuit has a self-inductance of 1H if a rate of change of current of 1A/s in the inductor induces in it an e.m.f. of 1V.

The mutual inductance between two circuits is 1H if a change of current of 1A/s in one induces an e.m.f. of 1V in the other.

The inductance of a coil is proportional to its cross sectional area, the square of the number of turns, and inversely proportional to its wound length.

Assuming no mutual inductance, for inductors both in series and in parallel, the equivalent inductance may be found by using similar expressions as with resistors. All inductors possess resistance. When an inductor is connected across a DC supply, the current takes a finite time to reach its final value of V/I. The time constant is an indication of the rate of rise of this current.

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