Re: Wiring consumer unit and shore power

In article <CcXMh.15781$s8.10382@xxxxxxxxxxxx>,
wilburhubbard@xxxxxxxxxxxxxxxx says...

"Duncan McC (NZ)" <hard@xxxxxxx> wrote in message
news:MPG.206f016676f3bb7a989760@xxxxxxxxxxxxxxxxxxxxxxx
In article <fcGLh.66687$_w.22818@xxxxxxxxxxxx>,
wilburhubbard@xxxxxxxxxxxxxxxx says...

"Geoff-Uphill" <geoff.rich@xxxxxxxxxxxxxx> wrote in message
news:1174351058.154551.243110@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Don't see its any
different to using any 240v appliance on the end of a 25m lead ?

I guess that means England uses 240VAC? Why do you guys use twice as
many volts as you need to run appliances? Here in the USA most stuff
runs on 120VAC except for some of the bigger things like welders,
etc.
We do the same jobs using half as much electricity.

You guys use twice the electricity you need to get the job done and
then
you complain about the United States contributing more to global
warming
gasses? How about getting your own house in order?

On second thought, keep up the good work. Melt the north and south
poles
and there will be more places to sail to.

I like your ideas on the North and South poles.

Can I suggest that your theory on voltage is flawed. Surely at school
you learnt:
V(olts) = IR (or I = V/R) and P(ower) = IV
Could we assume that house wiring around the world is, largely, the
same. This means R is the same. I'll let you do the rest :)

--
Duncan

The way I understand it is voltage can be likened to pressure. If you
have an air tank pressurized to 240psi and one the same size pressurized
to 120psi you can get twice as much air out of the 240psi tank. If you
don't need 240psi to inflate your car tires to 32psi,for example, and
inflating them reduces the tank pressure to 180psi then you could have
inflated the tires using the 120psi tank and had plenty enough air to
get the job done.

Now, the key is this. It takes more energy to fill an air tank to 240psi
than it takes to fill one to 120psi. So why waste energy filling the
tank up to 240 psi when you only need less than 120psi to get the job
done.

Now, take the same thing with electricity. Why fill (pressurize) the
wires with 240 volts which takes extra energy when you can fill them
with 120 volts and do the necessary work? As voltage goes up so does
impedance which means energy turned to heat and is wasted even more in
transmission. Try explaining that with some dumb formula.

There's just one problem with your analogy. Say you take yer bike pump
and pump it with your finger over the end. No heat (yet). It's not
until you let air bleed out (analogous to 'I' (current)) that heat is
generated. Yer with me?

So it's not the voltage that is 'wasted' as heat, it is the current.

Given the equation prev. mentioned: P = V^2 / R...

it is in fact your American system that is WORSE than the British, New
Zealand or Aussie - in fact every country bar America, Japan and some
south american countries (I think that's about it).

Doing the maths, you should quickly conclude you're about four times
worse off!

What voltages are used to get the power from your generation sources
to your homes? 1 volt? Less?
You work out why they use *large* voltage values (I've done it for
you already mind).
assuming the resistive value of wiring (anywhere on the planet) is
about the same; therefore the higher the voltage the less the
current (to produce the same power), and therefore less wastage
(current that is wasted as heat in the wiring).

--
Duncan
.

Relevant Pages

  • Re: Wiring consumer unit and shore power
    ... The way I understand it is voltage can be likened to pressure. ... wires with 240 volts which takes extra energy when you can fill them ... No heat. ...
    (uk.rec.sailing)
  • Re: shootin down that recon satellite
    ... The tank begins reentry nearly full of frozen hydrazine. ... most of the heat transferred to ... then this is the same pressure inside the tank. ...
    (sci.space.shuttle)
  • Re: Vapor as rocket propellant and coolant
    ... Iain> heat to the oxygen tank to make it self- pressurizing. ... Andrew> tank and the methane tank. ... how do you control pressure? ...
    (sci.space.tech)
  • Re: Well, what about that tank of hot?
    ... When it cools, the pressure ... The same amount of heat is generated no matter how fast or slowly the tank ... The true volume, in terms of the amount of gas contained in the tank, can be ...
    (rec.scuba)
  • Re: Cortank
    ... A core 'tank' could be pressurized to four or five ... of the volume of the airship. ... as a resovior for gas panels that would form a protective inert gas ... The Shenandoah was lifted by a squall to above its pressure altitude, ...
    (sci.energy.hydrogen)
Loading