Self Induction

Self-Induction, in electricity, is a property of electric circuits which causes electricity in some cases to apparently possess inertia. When an electromotive force is applied to a circuit, a magnetic field has to be created, and work most be done. This results in a back electromotive force, which, as it were, draws back the current, so that it only rises gradually to its steady value. The reverse effect occurs on breaking the circuit, as the lines of force, in closing up, generate an electromotive force which tends to keep the current flowing for a short time. Self-induction has an important effect on the action of alternate current apparatus. [ELECTRICITY.]