This is the fourth of five classroom Science lessons for upper primary school students. It identifies the electrical circuits inside appliances and how to draw them correctly. The product contains printable PDFs and complete answer sheets for teachers. With this resource, students will look forward to Science classes and teachers will become scientific geniuses without the use of expensive laboratory equipment. Each of the five lessons takes one hour to complete and the final assessment task and associated criteria (designing a new electrical invention to promote to the class) complies with Australian curriculum. The Inventions Science unit is a delight for confident, outgoing students as well as for students with a creative flair.