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# Can a Human Circuit Light an LED bulb?

This past year when we were building lemon batteries, students had many of their own investigative questions.  For one, students wondered if lemon juice would light an LED bulb.  As a result, we tested lemon juice, apple juice, salt water, and many other liquids.  Acting on their own questions fueled even more curiosity.

One student wondered if we could build a human circuit.  I didn’t think it would be possible to light an LED bulb with a human circuit.  I researched it on Google before I tried this activity with the students, and I found NOTHING about being able to light an LED with a human circuit.  I had the students predict whether they thought that we could accomplish the lighting of an LED.  Only about three out of ten students thought we could light the bulb.

Here is what we did:

1. I had each student get one alligator clip wire to connect a pre-1982 penny and a zinc nail.  (Doing this will give you about two more wires than you need, but at least everyone is busy.)