You may want to experiment with different metals. Go to http://en.wikipedia.org/wiki/Standard_electrode_potential_(data_page)
This table will tell you what voltages you will get when you use different metals. You may have to open your chemistry book to look up on the periodic table what the symbols for different metals are.
You will find the potential you get for a zinc copper battery, whick is close to what you got, 0.8 volts. You may want to switch to a different combination of metals and increase your plate area. The table will tell you what you get for different electrodes.
You may want to cheat a little and inject the lemon with concentrated lemon juice.
You may want to use something other than a mimi light. They draw way more amps that you will generate.
Try finding a digital clock that will run on a 1.5v battery.
Another idea will be to use aluminum foil and another metal. Put paper between the metals so the metals don't touch. Soak the paper in lemon juice. See how this works.
On the table aluminum Al is -1.6 v and copper is +.15 v
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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