This product consists of 20 pairs of flash cards (in PowerPoint) based on the topic Heat Transfer –Conduction, Convection & Radiation. This can be used for a small quiz, warm up or for a quick revision. The PowerPoint cards can be used after the completion of the topic which helps the class to understand the three modes of transfer of thermal energy. When I did my revision for this topic using these flash cards, my students gave a good feedback. Hope you find the same for your class! Please let me know your feedback!