[Avodah] electricity on shabbat

[Ben Waxman]

I thought that to be a psik reisha, first of all it has to be 100% (100% of 
all chickens who have their head cut off will die) and the melacha performed 
has to be a direct result of the action.

Ben
----- Original Message ----- 
From: "Micha Berger" <micha at aishdas.org>
>
> I suggest takig the casing off a light switch and seeing ho often there
> is a spark right before it closes. I would guess it's above 90%.
\