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Each individual lemon has a zinc electrode and a copper electrode inserted into it; the zinc is colored gray in the diagram. The slender lines drawn between the electrodes and the LED represent the wires. A lemon battery is a simple battery often made for the purpose of education.
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.
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Using a multimeter set on the 9.99 volts DC max scale, and with nothing else connected to the battery (that is, when measuring the "open circuit" battery voltage), the meter reads about 2.8 volts, or about 0.7 volts per cell. It is not a very good battery; I measure a short circuit current of about 6 milliamperes.
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It's unclear if Notre Dame would have even snapped the ball had Georgia not jumped, but they happily took the first down and proceeded to burn so much clock that there were only two minutes ...
U.S. President-elect Donald Trump on Saturday demanded that BRICS member countries commit to not creating a new currency or supporting another currency that would replace the United States dollar ...