Any suggestions, please?

Christopher Chan christopher.chan at bradbury.edu.hk
Fri Sep 10 15:25:45 UTC 2010


Colin Law wrote:
> On 10 September 2010 15:04, Dave Howorth <dhoworth at mrc-lmb.cam.ac.uk> wrote:
>> Colin Law wrote:
>>> I always think it is a bit of confidence trick selling electricity.
>>> The supplier sends us electrons up one wire but we have to send them
>>> back down the other so the supplier ends up with the same number of
>>> electrons he started with, but we still have to pay.  It does not seem
>>> right.
>> It's worse than that. The supplier basically just shakes the electrons
>> at you, like tassels on a ????
>>
>> According to <http://en.wikipedia.org/wiki/Electric_current>
>> "For example, in a copper wire of cross-section 0.5 mm2, carrying a
>> current of 5 A, the drift velocity of the electrons is of the order of a
>> millimetre per second."
>>
>> So in an AC circuit, the electron would get about 1/100 mm or 10 µm
>> before it turned around and headed back the way it came.
>>
>> I suppose the good news is that you get to keep your own electrons, that
>> were inside your coffee maker the whole time.
> 
> It is such a downer when ones witty comment gets trumped   :(
> 

Now that you know the level of the competition, you have to raise your 
game. :-P




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