currents in the kitchen

For this experiment i worked with Gavin and Owen we all brought fruits, the fruits we brought were a orange, apple and a lemon. For this experiment we are using a voltmeter a nail to put into the fruit and  a couple wires to connect verything. My hypothesis is that the lemon will have the biggest charge, because it has the most citric asid. For second i am guessing it is going to be the apple becasue the orange has a thicker shell. After doing the experiment the we saw the lemon had the most charge with 7v, just like i thought. the orange came second with 3v and the apple came last with 2v. i also noticed that the circuit has to be completed with no gaps or openings i know this becasue if the circuit is open then the it cant flow all the way through the curcuit.

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