Thislesson begins by revisiting the classic Batteries and Bulbs unit:students try to make a coin battery light up a LED and turn on a buzzer. Once they have addressed these basic challenges, students can explore lighting up two LEDs, or an LED and a buzzer, in parallel and/or series combinations. The Penguin Race toy is available to provide models of current, voltage, source and load.
Homework: Switch hunt. Provide the Switch Hunt Worksheet (downloadable below). Ask students to look for switches at home, and use the worksheet o describe where they found them, what they control and what they operate. See Lesson 2 for a typical list.
To learn about how LEDs work together, you can use a Digital Multimeter (see video). Forexample, the Multimeter will show you why a red or yellow LED will turn a green or blue one off, when they are both connected to the same battery. More information about the Digital Multimeter is available in the Appendix to ElectroCity.