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A lemon battery is a simple battery often made for the purpose of education. Typically, a piece of zinc metal (such as a galvanized nail) and a piece of copper (such as a penny) are inserted into a lemon and connected by wires.
This battery type is specifically designed to pollute less (see environmentally friendly claims) due to the lesser use or the absence of heavy metals. Water-activated batteries have been used in radiosondes that shouldn't contain heavy metals since they regularly fall to the ground or ocean surface, and indefinitely remain there.
The penny battery experiment is common during electrochemistry units in an educational setting. Each cell in a penny battery can produce up to 0.8 volt, and many can be stacked together to produce higher voltages. Since the battery is a wet cell, the effectiveness will be reduced when the electrolyte evaporates.
I read with some amusement an article published by BusinessWeek highlighting Apple's (AAPL) big plans to become a more green company. Apple CEO Steve Jobs pointed out in that article that his ...
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I assembled 4 cells, alternating washer, paper, copper, and stacked them together into a battery, being careful not to let the paper short circuit the cells. I placed some pieces of cedar shim on the top and bottom of the stack and clamped the whole assembly together tightly. I tested the battery with a yellow LED in series with a 66 ohm resistor.
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