Batteries
are all over the place -- in our cars, our PCs,
laptops, portable MP3 players and cell phones. A
battery is essentially a can full of chemicals that
produce electrons. Chemical reactions that produce
electrons are called electrochemical reactions.
all batteries have a maximum current they can produce
-- a 500 milliamp-hour battery cannot produce 30,000
milliamps for 1 second, because there is no way
for the battery's chemical reactions to happen that
quickly.
And at higher current levels, cell phone batteries
can produce a lot of heat, which wastes some of
their power. Also, many battery chemistries have
longer or shorter than expected lives at very low
current levels. But milliamp-hour ratings are somewhat
linear over a normal range of use. Using the amp-hour
rating, you can roughly estimate how long the cell
phone battery will last under a given load.
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