ABSTRACT
This chapter presents a magnetic field, provides comparison between a magnet and an electromagnet, and examines poles of an electromagnet. It details fundamentals of DC electric motors, Lorentz force, components of a DC machine and the importance of each one, and the characteristic curve for the performance of a machine. The chapter explains similarity between a DC motor and a DC generator, Faraday's law in electricity, and the difference between various types of DC motors. It explores the use of different DC motors for different applications, the rules of batteries in series and in parallel, and the conditions to put DC generators in parallel together. The chapter also details rated value(s) for an electric machine, shows what efficiency is and why efficiency can never be 100 percent, and also examines the efficiency of a motor. A DC motor consists of a winding that when connected to electricity an electric current will pass through all its loops.
