Question

What is EMF? How it is related to other parameters of current electricity? What is it's application in electricity?

Answer 1

Electromotive force, abbreviated emf (denoted as e and measured in volts) is the electrical intensity or "pressure developed by a source of electrical energy such as a battery or generator.

emf e = current × resistor

Emf e = V + Ir where r is the internal resistance

Application

Electricity's extraordinary versatility means it can be put to an almost limitless set of applications which include transport, heating, lighting, communications, and computation.Electrical power is now the backbone of modern industrial society.