Serving as a comprehensive overview of the science of electric currents, this updated volume investigates the conducting properties of various materials and goes on to describe ways of creating electric currents. It also describes how electricity is used in the home, in industrial enterprises, and in the world of communications. Common curriculum topics touched on in the text include moving charge, current and stored charge, resistance and power, direct and alternating currents, and electricity from machines. Activities help students understand practical applications, and a biography of science pioneer Thomas Edison is also included.