On Thu, 15 Feb 2007 02:52:43 GMT, (Doug Miller)
wrote:

In article , Mark Lloyd wrote:
On Thu, 15 Feb 2007 01:35:28 GMT, (Doug Miller)
wrote:

In article , Mark Lloyd
wrote:
On Wed, 14 Feb 2007 18:29:08 GMT, (Doug Miller)
wrote:

In article , "HK"
wrote:
Thanks everyone. Good information here.

This is a Grade 6 project and I was a little distressed to find that even
the basic concepts of electricity haven't been taught yet they are supposed

to build a basic circuit and working model.

For instance, my daughter assumed that to power two 6v lights, she needed a

12v power supply. Yikes.

So what's the problem? Connect them in series.

Or in parallel if the power supply is big enough. C cells may not be.

If you connect two 6V lamps in parallel to a 12V supply, you're quite likely
to see the two lamps doing an excellent imitation of fuses -- especially "if
the power supply is big enough".

I have done that before. They usually do not burn out immediately, but
glow brighter (and whiter) for awhile.

Of course that is not what I was talking about before. Maybe you
missed that what I said was an ALTERNATIVE to using 12V.

?

I was responding to your suggestion, visible above, that "if the power supply
was big enough" he could connect two 6V lamps in parallel to a 12V supply.


That just might have worked IF I had forgotten what I said, and you
had edited my quote to say that. "12V" does not appear in that quote
at all.

That won't work for very long.

OK, I left something out (saying to use 6V, or clarifying what "big
enough" means). That's no excuse to stick in something that doesn't
belong.
--
Mark Lloyd
http://notstupid.laughingsquid.com

"Unlike biological evolution. 'intelligent design' is
not a genuine scientific theory and, therefore, has
no place in the curriculum of our nation's public
school classes." -- Ted Kennedy