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>> Can anybody suggest why this might be?
>
> It's because heat represents a huge amount of energy.
>
> For instance, the humble calorie, the amount of energy required to raise
> a single gram of water by one degree celsius, is the same amount of
> energy required to lift that same gram of water about 387 meters in
> Earth's gravity, or accelerate it from zero to 87 meters per second.
Damn... pitty we can't use heat to do *useful* stuff!
--
http://blog.orphi.me.uk/
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46daa206@news.povray.org...
>
> Damn... pitty we can't use heat to do *useful* stuff!
>
Watt?
Marc
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> Probably, but I'm always reminded of the phrase "there ain't no such
> thing as a free lunch" - when it comes to generating heat, physics still
> applies. Doesn't mean things can't be more efficient than they currently
> are, though.
Problem with conventional cookers is they tend to heat up your kitchen
too...
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> Damn... pitty we can't use heat to do *useful* stuff!
You mean like to boil water to turn a big turbine that generates enough
electricity to run a city?
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> The most thirsty device I've found so far is... the kettle. It uses in
> excess of 3,000 W for the entire duration that you try to boil water with
> it.
That's about the most you will get out of a UK mains socket (230 V x 13
amps), but you'll probably find your electric cooker uses more when you have
everything switched on (it's usually wired directly into the distribution
board, so probably can't test it with your gizmo).
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>> - What device do you use to mesure power ? Is it expensive ?
>
> I said it in my blog, and I'll say it again here:
Believe it or not, but I started reading your blog a few days ago... But
I haven't gone through all the archives.
>
>
http://www.maplin.co.uk/search.aspx?menuno=80119&MenuName=Power%20and%20Energy%20Monitors&FromMenu=y&worldid=-6&doy=28m8
>
>
>
Thanks
>> - Have you tried to mesure the power used by electronic devices (TV,
>> HiFi, etc.) when they are on standby ? I find it difficult to get a
>> estimation for this, and it seems to vary greatly even among similar
>> devices ?
>
> Some devices actually use 0 W when off. (A few use 0 W even when on. For
> example, the clothes iron, once it's hot.) Most things seem to use less
> than 5 W while on standby.
> I should mesure this at home, to know for which devices it is meaningful
to put power off for energy savings (you know, global waarming etc.),
and for which devices it is not worth the effort.
5W on standby is quite a lot already : for one year (non-stop), it makes
roughly 44kWh, which is comparable to your kettle running at 3000W for
~14h (and how many cups of tea :-P ?) !
Thibaut
> And yes, the TV is one thing I still haven't got round to measuring!
>
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Thibaut Jonckheere wrote:
> 5W on standby is quite a lot already : for one year (non-stop), it makes
> roughly 44kWh, which is comparable to your kettle running at 3000W for
> ~14h (and how many cups of tea :-P ?) !
Yeah, it is really.
I was quite surprised that my PC uses 4 W even when it's "turned off"...
(I'm not sure I *want* to know what my laser printer uses. That's
permanently turned on too!)
--
http://blog.orphi.me.uk/
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scott wrote:
>> The most thirsty device I've found so far is... the kettle. It uses in
>> excess of 3,000 W for the entire duration that you try to boil water
>> with it.
>
> That's about the most you will get out of a UK mains socket (230 V x 13
> amps), but you'll probably find your electric cooker uses more when you
> have everything switched on (it's usually wired directly into the
> distribution board, so probably can't test it with your gizmo).
You're right: I can't. I have a gas cooker. ;-)
I just find it bizzare that this huge washing machine, spinning away to
violently that it's deafening to stand near and you'd probably be
injured if you touched it, uses about 5% of the power of a teeny little
kettle. Far out!
I'm currently measuring the fridge. Surprisingly, it uses a whole 100 W
when the compressor is running. (I was expecting lower.) OTOH, it
doesn't run for long...
PS. 230 V? I thought it was 250 V...
--
http://blog.orphi.me.uk/
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46dac2d2$1@news.povray.org...
> I just find it bizzare that this huge washing machine, spinning away to
> violently that it's deafening to stand near and you'd probably be injured
> if you touched it, uses about 5% of the power of a teeny little kettle.
> Far out!
Did you measure your washing machine while it is warming water?
Marc
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"Orchid XP v3" <voi### [at] dev null> wrote in message
news:46dac2d2$1@news.povray.org...
> scott wrote:
>> That's about the most you will get out of a UK mains socket (230 V x 13
>> amps), but you'll probably find your electric cooker uses more when you
>> have everything switched on (it's usually wired directly into the
>> distribution board, so probably can't test it with your gizmo).
>
> You're right: I can't. I have a gas cooker. ;-)
> I just find it bizzare that this huge washing machine, spinning away to
> violently that it's deafening to stand near and you'd probably be injured
> if you touched it, uses about 5% of the power of a teeny little kettle.
> Far out!
A. Didn't you say it uses 600W at final spin speed? That's 20% of 3000...
B. It only seems bizarre because you already had decided on the way things
are before learning even the first fact about them (ie. do an experiment
like this, or study electrical theory). It's really cool to go "wow!" and
be excited about new discoveries. But you are kinda saying that things you
haven't seen should behave exactly as your head imagined it, rather than
work the way it always has done, only waiting for you to come along and
discover it. Actually, now I think of it, you do that rather too often,
which is unfortunate because you limit yourself then... :'-s
N'est-ce-pas? ;-)
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