It's always confused me sometimes.

My example of confusion.

A 100 watt bulb, now i know watt is watts/second, so does a 100w bulb use
100w/second or 6000 w/min or 360,000 w/s. Well if it did it'd be well beyond
my income to pay for a single bulb yearly.

so it must be 100w/hour, so does that mean the bulb is actually using
100/360000 4.7E-4w/second !

And if you put 12volts across a 1ohm resistor, the power put in would be 12
watts, now is that also w/second or w/hour !

Over here ( UK) a kw is approx 5 pence ( if you know the actual price per kw
please let me know ;) so does a l00w light bulb cost 5p/10hours.

just a little bit more confusion for some :o)

Ken

> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu]On Behalf
> Of Gerhard Fiedler
> Sent: 04 August 2006 1:14pm
> To: piclist@mit.edu
> Subject: Re: [EE] : Interpreting power with time
> 
> 
> Mohamed Ismail Bari wrote:
> 
> > I want to know how this power can be
> > releated to time. Should I say the dissipation as 1W/Sec or 
> 1W/min or
> > 1W/Hr?????.... (My guess is 1W/Sec) I am sure this is a 7th 
> grade math.
> > Probably, I was not paying attention when I was in 7th grade..;-).
> 
> That's not math, that's physics, more specifically about the 
> relationship
> the different units have with each other. Which is a quite 
> nice and logic
> system -- if you use SI units, and not one of the different customary
> systems. 
> 
> A quick overview: 
http://physics.nist.gov/cuu/Units/units.html (you find
the Watt and the Joule there, too). 

Gerhard

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