In the previous module, you learned about spontaneous redox reactions, which are reactions in which electrons are transferred from one substance to another. Is it possible to harness these electrons as a source of electricity? The answer is yes!

In a voltaic cell, electrons are made to pass through an external circuit instead of passing directly from one substance to another within a solution.

In this lesson, you will learn about the parts of a voltaic cell and how these parts work together to convert chemical energy into electrical energy. You will learn in more detail how batteries involve an application of redox reactions.

Not all applications of spontaneous redox reactions are constructive. In this lesson, you will consider corrosion as a destructive process and learn how this problem can be minimized.