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When I do B & B, the activity, not the drink, I start using
smaller batteries, usually AA rather than D cells or dry
cells. I do this because beginners are likely to short the
wire across the battery terminals if they just have a
battery, bulb, and one wire. The smaller cells have a small
shortcircut current and are less likely to burn their
fingers where the wire contacts the battery terminal.
Swapping batteries later give me a chance to keep track of
how many they have, and hence save on bulbs.
cheers,
joe
On Thu, 4 Apr 2002,
Chris Horton wrote:
Another trick about flashlight bulbs is not to let the
students lay their hands on more than two dry cells. I
was lax and naive on this and before I knew it there were
bulbs burning out in flashes of glory all over the
classroom as students connected 5 or 6 cells in series!
That can get expensive.
In one way or another let them know from the start they
will be held responsible if they blow bulbs frivolously.
8-)
Chris
Joseph J. Bellina, Jr. 219-284-4662
Associate Professor of Physics
Saint Mary's College
Notre Dame, IN 46556