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Learning
with old batteries and cans 1: Measuring electricity
You
can learn a lot from old batteries and cans.
Left:
This Cola can, the rusty battery and the screw are attracted by a magnet.
Middle:
With such a yellow box you can measure which battery is empty and which
is full of electricity:
Right:
This battery is not old: It does not show 0.00 but 90 (Volts).
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modification: 08.01.2003
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