Those who could afford it used candles. Later, a fuel kerosene was used in special lamps. As time passed an illuminating gas provided light in the homes and on the streets. Finally, electricity came along and now practically all have artificial light. Since the invention of electricity, man has not been able to get along without it.
Electricity is a form of energy.
Energy has the capacity to do work. Today there seems to be a never ending stream of machines that do a myriad of jobs for man to make his lifestyle less taxing and in many instances very comfortable. It is through electrical technology that this has all been made possible. Man s lifestyle has been enhanced socioeconomically in transportation, jobs, and leisure time. This unit is a basic unit on electricity.