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two years. However, used batts. do not, i.e. in ~1 / 2 year become"drained", tho originally had an OC V ~ 9 V.
Drained 9 volt batteries are considerably easier to get for free than
fresh ones. The HV sparks don't draw much current, just a brief
discharge of the accumulated charge. (As electrostatic as any other
spark)
If there still a speck of metallic zinc left in the battery, some
charge separation will occur with essentially 9 volts of potential
difference.
At 3:40 PM -0800 2/9/03, Tucker Hiatt wrote:
Why is it important that the 9-V batteries be drained? And if one
terminal of the series-linked batteries is connected to the knob of
the electroscope, to what is the other terminal connected? Thanks in
advance, Tucker
Sam Sampere wrote:
> >To help make this simple connection, chain a bunch of drained 9 V
>batteries together in series and connect the terminals to a gold leaf> Sam
>electroscope.
>