I think i have mentioned before but my first brush with electrocution was playing with a string of 20 xmas lights when very young. Marked as 14v on the bulb with a 240v supply. Thought i could jamb bits of wire in the socket to bring out the contacts and got badly zapped. I was shocked that i got it sooo wrong Perhaps they are a bit young but a good lesson when driving home ohms law is to have 3 globes in series and ask what would you expect the volt drop across each globe to be. 6v batt with 2v globes works well. Then ask them to remove the centre globe and ask what the expected voltage would at the contacts where the middle globe was. Basically, I learnt this lesson when young ... removing one 14v xmas light left 240v potential across the contacts. When asking techs at work about the 3 globe puzzle I got many varied responses. I think this is a good lesson as it drives home the whole voltage drop current flow thing and can be easily demonstrated. I was also recently surprised how expensive those little globes are. On 19/09/2015 2:04 AM, "Denny Esterline" wrote: > So, I have opportunity to reach about two dozen cub scouts about 6-9 year= s > old. I'm looking to start them with very basic electricity (battery, bulb= , > wire) and move them on to some more advanced stuff. > > There's a vague thought in the back of my mind about documenting the > process and turning it into something publishable (blog post, hardcover > book or something in between, TBD) > > So, I'm soliciting suggestions for two things, projects and sources. > > I'm thinking start with a pair of penlight cells and an incandescent bulb= .. > I do think as a beginning a bulb is better than an LED for a few reasons, > but moving to LEDs should follow fairly quickly. > > Trouble is, I was immediately stymied by the cost of incandescent bulbs. > Over $5 US each at the local hardware store had me running for the door. > Even Ebay seems to be around $1/bulb. (I plan to explore Christmas bulbs > this weekend) So, clearly, sourcing things for what is essentially a thro= w > away can be quite painful. > > > So.. Thoughts? > > -Denny > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .