Hi all.

Viewing this:  http://tinyurl.com/23utmeo in the store, I wondered how
many amps it would use. On the back it says: 12 Watts, 12 Volts. Only
vaguely recalled Ohm's Law at that moment, didn't obviously know the
resistance of the unit, so couldn't calculate amps used. Bought it
anyway.

At home checked current draw. Low -  0.45 amps. High - 0.6x amps

But entering 12 volts and 12 watts here,
http://www.the12volt.com/ohm/page2.asp shows 1 Amp. Here:
http://www.csgnetwork.com/ohmslaw2.html  0.58 amps. They both *appear*
to use the same formula though the latter gives closer to what I
measured on high speed, hence the makers rating I assume.

What am I missing or doing wrong? Or more to the point, what formula
should I memorize?

Looks were deceiving. Had it been over 1 amp draw, I likely wouldn't
have purchased it thus saving time. As it turns out, for my needs,
0.45 amps/hour over a few nights use, shouldn't draw down my group 42
aux. battery too far.

Thanks!

Neil.

--
Neil Nicholson '81 VanaJetta 2.0 "Jaco"

http://tubaneil.googlepages.com/

http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines