Why do some power cables have two conductors and some have three? Ladyada explains that three prong cables are grounded and provide a layer of safety in electronics. Ladyada and Adabot go through the lab looking for grounded items. Part of the "Circuit Playground" series.
Great video. Helped encourage my students to inquire about the plugs in their home and what that means for each of the devices based on the number of prongs.