How about monitoring moisture in soil, where the resistance between two probes changes as function of the amount of moisture (water) present, due to the minerals/elecrolytes that get disolved by the water when present. This would be useful for figuring out when to water indoor plants, or perhaps automatically maintaining a specific level of moisture. Given a battery circuit and probes in the soil, you might be able to demonstrate a current change with just an milliammeter. There ar lot of possible varitations on this one. -George Stults
-----Original Message----- From: Joe P Martin [mailto:[email protected]] Sent: Wednesday, September 11, 2002 3:58 PM To: [email protected] Subject: Water + Electricity Greetings, A friend of mine is teaching elementary school students on the dangers of mixing water with electricity. However, he also wants to show examples of situations where water and electricity mix, yet does not cause a problem. Does anyone have any examples? Also, does anyone have a great elementary school explanation as to what elements or conditions are needed to be present before water and electricity become dangerous? All responses are appreciated. Joe Martin Applied Biosystems [email protected] ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
