This is a writing exercise for the student, and answers will vary.
Work Step by Step
Sample: Hi grandma. Do you remember that time I got you to lick the terminals of a 9-V battery and you got a little tingle? Sorry about that; I hope you have forgiven me. I remember thinking that the electrons from the battery gave you the shock. Here's some shocking news: I was wrong. The electrons that were already in your tongue are the ones that started moving when the electric current was established, and THEY gave you the shock.