Julian Ilett works with a Peltier cooling unit provided by Banggood to study the principles of thermodynamics and how thermoelectric (TEC) cooling processes work and the basics of TEC cooling. Peltier units warm on one side when connected to a battery and stay cool on the other. The temperature gradient conducts electricity.

To learn more about the subject, visit http://blog.owenversteeg.com/post/63988453246/peltier-element-identification.