ABSTRACT
This chapter explains electromagnetic induction, Faradays laws, Lenzs law and Flemings rule and develops various calculations to help understanding of the concepts. An electro motive force (e.m.f.) is induced in the conductor as a result of its movement across the magnetic field. This effect is known as electromagnetic induction. Lenzs law states, the direction of an induced e.m.f. is always such that it tends to set up a current opposing the motion or the change of flux responsible for inducing that e.m.f. Flemings Right-hand rule which states, let the thumb, first finger and second finger of the right hand be extended such that they are all at right angles to each other. A transformer is a device which uses the phenomenon of mutual induction to change the values of alternating voltages and currents. If N2 is less than N1 then V2 is less than V1 and the device is termed a step-down transformer.
