Electricity is the energy from moving electrons. Electrons move during redox reactions. Redox reactions can be used to generate electricity. A device that uses a redox reaction to produce electricity is called an electrochemical cell or a voltaic cell. This PowerPoint presentation explains how electrochemical cells work, from the chemical reactions that drive them to the parts that enable electrons to flow, Worksheets on this topic are available free of charge on my website at www.evanschemistrycorner.com.