You could use the energy ball that creates a human circuit. I have seen a few of those types of toys that have an open circuit and have kids figure out why it works in a ring of people when they hold hands.
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Hi! I introduced the idea of electrical circuits when we studied the human body, particularly the brain. Then we moved on to our physics unit on energy and motion and are now connecting the idea that motion can be converted to light, sound and heat including wind turbines to generate electricity. Check out the Boeing lesson on wind turbines: https://www.teachingchannel.org/wind-energy-engineering-unit-boeing
My thinking is the Energy Stick which can also be used for the Human Circuit and it transparent so student can see inside it,
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I always try to keep phenomena simple and easy for students to identify on their own...so for this concept I would ask someone to turn off the classroom lights, then turn them back on.
It would also be fun to ask them what happens when they open their fridge at home ;)
You might consider reaching out to your local branch of IEEE (http://ieeexplore.ieee.org/document/7044461/). This great group of electrical engineers has done several teacher presentations in the Kansas City area and has even prepared boxes of demonstrations. I've never met a student who wasn't engaged after experiencing a van de graff generator!
Why does electricity flow through some circuits, but not all?
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