ABSTRACT

This chapter explains electromagnetic induction, Faraday’s laws, Lenz’s law and Fleming’s rule and develops various calculations to help understanding of the concepts. It aims to understand how an electromotive force (e.m.f.) may be induced in a conductor and discusses Michael Faraday’s laws of electromagnetic induction. Faraday is generally credited with the discovery of induction in the 1830s. Faraday’s law of induction is a basic law of electromagnetism that predicts how a magnetic field will interact with an electric circuit to produce an e.m.f. Alternating current generators use Faraday’s law to produce rotation and thus convert electrical and magnetic energy into rotational kinetic energy. A major application of transformers is to increase voltage before transmitting electrical energy over long distances through cables. Cables have resistance and so dissipate electrical energy. By transforming electrical power to a high-voltage, and therefore low-current form, for transmission and back again afterward, transformers enable economical transmission of power over long distances.