Newnes Circuit Calculations Pocket Book

8 Inductors

8.1 Introduction

Inductors consist of coils of insulated wire wound on bobbins or

formers.

Inductance is the property of the coil which tends to prevent a

change of current in a circuit. When current is flowing in a coil of

wire,

magnetic flux is produced which cuts the coil, and when this

current is changing a voltage is induced in the coil. The induced

voltage exactly balances the applied voltage which is producing the

current.

Inductance, L, is measured in henrys, which have unit symbol H,

and a closed circuit has an inductance of one henry if an

e.m.f.

of

one volt is induced when the current is varying at one ampere per

second ...