Thursday, March 5, 2009

potential, potential difference, voltage, volts

Voltage means potential difference.  So when someone says, "The voltage of that power line over yonder is at 10kV."  What they mean is that the potential to which the wire itself is set is 10kV ABOVE the potential of the earth or ground.  Typically we take ground to be zero volts, but the 10kV has to be in reference to something standard.  Otherwise, it makes NO SENSE to say something is just at "blah" volts, unless it's in reference to something everyone listening understands what the implied reference is.  Therefore, people who don't REALLY know what they're talking about in say a scientific situation where everyone should be on the same knowledgable page should make sure to include to what their potential is referencing.

ALSO, volts is only the unit of potential and thus potential difference (voltage), SO you cannot interchange the words to hope for the same meaning in what you present.

Tuesday, March 3, 2009

flame

Instead of laying down to read as I had initially planned about twenty minutes ago, I've been downloading my photos.  While they transferred from camera to computer, I watched my candle light flickering.  No no, I'm not sitting in the dark with the glow of my computer screen and one lit biscotti scented candle as I may have made you imagine.  I've my corner medusa lights on too.  Back to my biscotti light.  

Nope.  
I just went on a net-tangent reading about the earth's magnetosphere...at least it's relevant.

Despite a simple candle flame not truly being a plasma, I still think it exhibits a very similar structure as the auroras.  If you look closely, the tip of the flame sometimes has noticeable cuts jutting into it to make it look like the curtain shape of the auroras.

Maybe that's god's way of giving a little bit of spectacular lights to anyone who can create a flame.

Awww.