Apply the charged comb to a neutral (non-charged) item and see what happens. The concepts of objects being charged will translate in future years to understanding electrical concepts within the human body. You should also discuss how static electricity can affect sensitive circuits and how they can be protected by using a ground wire. This experiment can also explain why magnets and devices that produce an electromagnetic field are not allowed around sensitive medical devices. A very fun way to demonstrate conductivity involves lemons. Since acidic fruits make ions or charged particles, they can act as batteries. An experiment testing which fruit best conducts electricity is a perennial favorite. The concept of conductivity will apply to electrical circuits in the human body as well as in devices. As this experiment involves the flow of electricity and use of a knife to cut the fruit, you should supervise your child when she is building and practicing the experiment.
