On Wed, 29 May 2013 13:09:14 +0100, Harry Bloomfield
wrote:

Remember the old type charge / discharge ammeters, where used a couple
of turns of cable which used to sometime be fitted to vehicles ? I have
one fitted to the tractor mower which is not marked + and - and I'm
sure it reads the wrong way. The needle goes left when on charge, I
seem to remember the norm is to move to the right.

Can anyone remember, before I take steps to correct it?

Fleming’s Left Hand Rule
http://www.le.ac.uk/se/centres/sci/selfstudy/mam12.htm


Oh wait, maybe it's the right hand rule
http://physicsed.buffalostate.edu/Se...ce/rhr/rhr.htm

hth ;-)

--
Graham.

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