[Prev][Next][Index][Thread]

Re: Cap charge, where is it?



Hi Folks,
	With all this lenghthy thread going on, I am surprised that no one has
mentioned the old styrofoam cup trick. One of my firmest recollections
of freshman physics class is the day when the instructor demonstrated
how to make a capacitor out of a styrofoam cup. He lined the inside with
one piece of aluminum foil, and wrapped the outside with another piece,
and then charged it with a HVDC supply. Then he carefully removed the
aluminum foil, and since I always sat on the front row and like to be in
the middle of everything, he handed me the "empty" cup and invited me to
fill it with water and have a drink, which somehow I felt compelled to
at that moment. I got zapped on the first sip, and spilled water all
over myself, and the class got a big laugh, but I think I will always
remember where the charge resides.

Storey Clamp