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    Need help solving problem on daughter's schience project.

    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...
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    Need help solving problem on daughter's schience project.

    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...
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    Need help solving problem on daughter's schience project.

    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...
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