Lesson 3 How Does Electric Current Flow through Circuits?

feature that prevents dangerous shocks if a wire comes loose in the appliance. Stick a brass thumbtack into one side of a lemon and a steel paper clip into the other side. Cut 1 cm of plastic away from both ends of a 20-cm (8-inch) insulated wire. Do the same to a second wire of the same length. Twist one end of the first wire around the