Electrical Fundamentals of Communication

The currents, voltages, and powers used in communication range from microamperes, microvolts, and microwatts to many amperes, thousands of volts, and hundreds of kilowatts. The frequency range extends to billions of cycles. Communication systems consist of a large number of separate units, grouped together into complex electrical networks. The lines employed between distant cities are long, and phenomena that are not considered in other electrical work are of extreme importance in communication.

This chapter will be devoted to a brief consideration of those electrical phenomena that will later be of use in studying electrical communication. The material should be regarded as extremely essential, as many points of fundamental importance in communication will be presented.