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Date: Fri, 16 Mar 2012 22:37:00 +0800
Message-ID: <CANDNR8rZbTeUsMBiLzpOthArsDmQ566_-UNuTvZumdzqK1zCJg@mail.gmail.com>
Subject: Re: [geda-user] Daughter's Science Fair
From: Atommann <atommann AT gmail DOT com>
To: geda-user AT delorie DOT com
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2012/3/16 Rob Butts <r DOT butts2 AT gmail DOT com>:
> My nine-year-old daughter has a science fair tomorrow.  We are doing simple
> electromagnets out of nails.  We are just using one C battery with
> approximately a 30-penny nail and 26 guage wire wrapped around the nail for
> two layers.  When the battery is connected the nail has a good magnetic
> strength in that it will pick up another nail not just paper clips.
>
> I was thinking about showing how a current in one coil will induce a current
> in another (how an electric toothbrush charges).  We rigged up another nail
> the same way but with a little bulb attached.  Check my theory, shouldn't
> the electromagnetic field produced by the coil and nail with the battery
> induce a current in the other coil when placing the nails adjacent
> and parallel?

I have an ideas:
Use a longer nail and wrap two coils on the same nail, one coil will
be connected to the battery with a switch while the other one will be
connected to a small bulb. When you turn on/off the switch see what
happens.

-- 
Best regards,
Atommann