[Avodah] running creates electricity

[Chaim Tatel via Avodah]

Eli Turkel asked:

"one can create electricity on ones clothing by running.
Is this allowed on shabbat?"

I would venture to say it's OK.
The Gemara in Masechet Eruvin (100) discusses the issue of whether one is
permitted to walk on grass on Shabbat, given the possibility that he may
uproot blades of grass in the process, unintentionally violating the
prohibition of "Tolesh" – uprooting plants on Shabbat.

The Shulchan Aruch (336:3) writes that one may, in fact, walk on grass on
Shabbat, because Halacha follows the view of Rabbi Shimon who allows
performing an act on Shabbat that might result in an unintentional Melacha
(forbidden activity). So long as it is not certain that the Melacha will
result from the given action, one may perform that action despite the
possibility of a Melacha occurring as a result.

Therefore, one may walk on Shabbat over grass of any kind, whether it is
moist or dry. One may even walk on grass while barefoot, despite the fact
that grass might stick to his feet and thus be detached from the ground. It
should be noted, however, that if grass does stick to one's feet, he may
not remove it by hand, since the grass is considered Muktzeh (forbidden to
be handled on Shabbat). He is allowed to shake the grass off or rub his
foot against a surface to remove it, but he may not remove it with his hand.

see http://www.dailyhalacha.com/m/halacha.aspx?id=1088 for more info.

Chaim Tatel, Outer Golus
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