Sources of Electric Current
. There are several different devices that can supply the voltage necessary to generate an electric current. The two most common sources are generators and electrolytic cells. A. Generators Generators use mechanical energy, such as water pouring through a dam or the motion of a turbine driven by steam, to produce electricity. The electric outlets on the walls of homes and other buildings, from which electricity to operate lights and appliances is drawn, are connected to giant generators located in electric power stations. Each outlet contains two terminals. The voltage between the terminals drives an electric current through the appliance that is plugged into the outlet. See Electric Power Systems . B. Electrolytic Cells Electrolytic cells use chemical energy to produce electricity. Chemical reactions within an electrolytic cell produce a potential difference between the cell’s terminals. An electric battery consists of a cell or group of cells connected together. C. Other Sources The...