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help with Science project! involves fruits and a multimeter?
ok it said i had to put a zinc nail and copper wire in a fruit and i could use a voltammeter to find the electrical current the fruit would make. BUT a guy at radioshack told me that this thing called a multimeter is a voltammeter. Ok it has to things attached to it so i put them in the fruit thinking they could replace the copper wire and zinc nail. I got results but some had a - sign next to them. And there's like a whole bunch of settings. There is DCV, AVC, OHM, and DCA and sub setting but i understand them. BUT which do i set it to measure voltage. Plus i put them in a lime and that - sign came again so i switched them and it wasn't in the negatives anymore. SO it confused me so i was wondering which way is right and does a fruit have a negative and positive side like a battery. because of of those wires in negative and one is positive. SO PLZ HELP IF U CAN! i am only 12 i don't get this stuff! and my project is due soon.
What you look at on the multimeter is an ammeter. It requires a low current for full deflection of the needle. By adding resistors in series it limits the amount of current flow and can be calibrated to measure voltage. By adding resistors in parallel it can be calibrated to measure higher currents.
The fruit is acting as an electrolyte. The copper wire and zinc nail form the anode and cathode of the cell.
Wikipedia is your friend... There are a few other links on the page which may help explain things.
http://en.wikipedia.org/wiki/Lemon_battery
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