Thanks all for the suggestions. I may use the Stop Watch method, as suggested, for awhile to get get things started. Meanwhile looking for a more automated way to time it. The stop watch idea is good and basic, but poses potential problems like forgetting to check it before the cells run out...
Thankyou so much for the quick reply. To answer your question 7th gd. is middle school; age for 7th graders is 12-13y.o., 8th gd is 14-15, etc. Your solution is a bit much for this 12 year olds science project. I was looking for something much simpler. Plus she needs to monitor the test and...
HELP for a 7th gd science project. HYPOTHESIS: do disposable AA cells last longer than rechargeable cells in a portable CD player? SET-UP: 2 AA cellS driving CD player. In series with cd PLAYER is an ampmeter; a DVM measures cell voltage. Added a digital clock to stop when the batteries...