How many watts does it take to do a certain task ? (need a

G

George

Guest
I'm wondering if there's some sort of list out there, that lists the
number of watts, and what that number of watts can power.

1 watt powers a ?
2 watts power a ?
3
4
5
and so on.

Please advise, if such a list exists.
 
Power (measured in Watts) is a measure of energy (Joule) per unit time
(second).

There are two useful formulae depending on whether you are working with
electricity or not.

Electricity :

Power = Voltage x Current

So a 1 watt device could be powered by 10 V @ 0.1 A, 1 V @ 1 A, 100 V @
0.01 A, etc. If you were using a 9 V battery and required 0.45 W (watts)
then you would have to draw 50mA (milliamps).


Non electrical :

If you have a device that produces usable energy eg a motor or heater, you
can work out what can be done if you know the wattage of the device. You
may also need to know the efficiency.

A 100 W heater, will produce 100J of energy per second. If you were
warming a room, and knew the heat loss per second, you could calculate the
size of the heater required to maintain a constant temperature.

A 100 W motor, with an efficiency of 50% (ie half the power is lost in
friction, heating, noise) will be capable of 50J per second. You could
calculate the acceleration this would provide to a model car.
 
I've made such lists in the past. Here are some examples...

0.001 watt powers a digital wristwatch

0.25 watt powers an electric clock motor

5 watts power a small night light

60 watts power a desk lamp or a laptop computer

200 watts power a personal computer or good-sized stereo system
(note that I'm talking about AC consumption, not audio output power)

1000 watts power a window air conditioner

2000 watts power a portable electric heater

10,000 watts power a house

These are rough estimates. Others can chime in with better ones.
 
"George" <spamproofemail@here.com> wrote in message
news:h7vck0l5ebe4lppqvesju0uvlo6ht6th2o@4ax.com...
I'm wondering if there's some sort of list out there, that lists the
number of watts, and what that number of watts can power.

1 watt powers a ?
2 watts power a ?
3
4
5
and so on.

Please advise, if such a list exists.
Click to expand...
A-Level (high school) text books often give a table like the one you seem to
want - although not with 1 watt resolution. They usually illustrate the
idea with things like {light bulb, hair dryer, television, train}.......
Other than that try www.google.com

Andy



--
--
The above email address is whitelisted.
If I don't have your address already, I wont see your message.
 
On Tue, 14 Sep 2004 21:38:08 +0000 (UTC), Uwe Bonnes
<bon@elektron.ikp.physik.tu-darmstadt.de> wrote:

Michael A. Covington <look@ai.uga.edu.for.address> wrote:
: I've made such lists in the past. Here are some examples...

: 0.001 watt powers a digital wristwatch

: 0.25 watt powers an electric clock motor

: 5 watts power a small night light

: 60 watts power a desk lamp or a laptop computer

: 200 watts power a personal computer or good-sized stereo system
: (note that I'm talking about AC consumption, not audio output power)

: 1000 watts power a window air conditioner

: 2000 watts power a portable electric heater

: 10,000 watts power a house

: These are rough estimates. Others can chime in with better ones.


The human body consumes an equivalent of about 200 Watt...
Click to expand...
---
Behind a 2000 Calorie diet, about 100 watts.

--
John Fields
 
Michael A. Covington <look@ai.uga.edu.for.address> wrote:
: I've made such lists in the past. Here are some examples...

: 0.001 watt powers a digital wristwatch

: 0.25 watt powers an electric clock motor

: 5 watts power a small night light

: 60 watts power a desk lamp or a laptop computer

: 200 watts power a personal computer or good-sized stereo system
: (note that I'm talking about AC consumption, not audio output power)

: 1000 watts power a window air conditioner

: 2000 watts power a portable electric heater

: 10,000 watts power a house

: These are rough estimates. Others can chime in with better ones.


The human body consumes an equivalent of about 200 Watt...

--
Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
 
George wrote:
I'm wondering if there's some sort of list out there, that lists the
number of watts, and what that number of watts can power.

1 watt powers a ?
2 watts power a ?
3
4
5
and so on.

Please advise, if such a list exists.
---------------
Click to expand...
A Watt is a Joule/second. A Joule of kinetic energy is given to a
kilogram when it is accelerated so that it gains 1 meter per second
each second for a distance of a meter.

2 Joules would be 2 kilograqms, or 2 m/s, etc.

A J = (1 kg-m-m/s/s) and a W = (1 kg-m-m/s/s)/s = kg-m^2/s^3

There are lots more equivalencies that can be discerned directly from
the physics of the factor label metric system. TAKE PHYSICS!!

-Steve
--
-Steve Walz rstevew@armory.com ftp://ftp.armory.com/pub/user/rstevew
Electronics Site!! 1000's of Files and Dirs!! With Schematics Galore!!
http://www.armory.com/~rstevew or http://www.armory.com/~rstevew/Public
 
"CWatters" <colin.watters@pandoraBOX.be> wrote in message
news:ibU1d.246675$kY2.12658805@phobos.telenet-ops.be...
70,000,000-100,000,000 W powers the QE2!
Click to expand...
120,000,000,000 W powered a Saturn 5 First stage (150,000,000 HP)
 
Uwe Bonnes schrieb:
The human body consumes an equivalent of about 200 Watt...

Hello,
Click to expand...

at rest, it is only 70 to 100 W.
But Lance Armstrong may consume up to 1800 W.

Bye
 
On Wed, 15 Sep 2004 01:05:34 GMT, R. Steve Walz wrote:

There are lots more equivalencies that can be discerned directly from
the physics of the factor label metric system. TAKE PHYSICS!!
Click to expand...
He probably *IS* taking physics. Hence his curiosity.
Having seen all the formulae, definitions and equations he can stand, he
wants something he can hang his hat on to give a conceptual understanding
of the magnitude of the entities he's dealing with.

Bob
 
"Uwe Hercksen" <hercksen@mew.uni-erlangen.de> wrote in message
news:41483122.4020007@mew.uni-erlangen.de...

at rest, it is only 70 to 100 W.
But Lance Armstrong may consume up to 1800 W.
Click to expand...
I always thought that the most a human could produce (other than in short
bursts) was less than 1 HP and more like a 1/3rd.
 
Uwe Hercksen <hercksen@mew.uni-erlangen.de> wrote:


: Uwe Bonnes schrieb:
: >
: > The human body consumes an equivalent of about 200 Watt...
: >
: Hello,

: at rest, it is only 70 to 100 W.
: But Lance Armstrong may consume up to 1800 W.

Oops: 2000 kCal/day * 4.2 Ws/Cal /24 h/day / 60 min/hour /60 s/min
is around 100 Watt.

Thanks for the correction.
--
Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
 
On Wed, 15 Sep 2004 13:57:09 GMT, Bob Stephens
<stephensyomamadigital@earthlink.net> wrote:

On Wed, 15 Sep 2004 01:05:34 GMT, R. Steve Walz wrote:

There are lots more equivalencies that can be discerned directly from
the physics of the factor label metric system. TAKE PHYSICS!!

He probably *IS* taking physics. Hence his curiosity.
Having seen all the formulae, definitions and equations he can stand, he
wants something he can hang his hat on to give a conceptual understanding
of the magnitude of the entities he's dealing with.

Bob
Click to expand...
What a horrible and totally mis-led exaggeration you imagine.
There are doctors for that.

I take what you've implied as slanderous, against me.
And for what?

If that's how you want to respond to any more questions I post,
then stay out of my threads.

But, I guess if that's the most intelligent response you can offer my
question, that you otherwise come to this ng to see the spammed porn
ads. I imagine there are doctors for that too,
 
Andyb says:

A-Level (high school) text books often give a table like the one you seem to
want - although not with 1 watt resolution. They usually illustrate the
idea with things like {light bulb, hair dryer, television, train}.......
Other than that try www.google.com
Click to expand...
And this info can be found at device ratings, or computed from voltage/current
ratings.

--
Chaos MasterŽ, posting from Brazil. REPLY TO GROUP!
"People told me I can't dress like a fairy.
I say, I'm in a rock band and I can do what the hell I want!"
-- Amy Lee

Note: this e-mail address goes to /dev/null.
 
On Wed, 15 Sep 2004 01:05:34 GMT, "R. Steve Walz" <rstevew@armory.com>
wrote:

George wrote:

I'm wondering if there's some sort of list out there, that lists the
number of watts, and what that number of watts can power.

1 watt powers a ?
2 watts power a ?
3
4
5
and so on.

Please advise, if such a list exists.
---------------
A Watt is a Joule/second. A Joule of kinetic energy is given to a
kilogram when it is accelerated so that it gains 1 meter per second
each second for a distance of a meter.

2 Joules would be 2 kilograqms, or 2 m/s, etc.

A J = (1 kg-m-m/s/s) and a W = (1 kg-m-m/s/s)/s = kg-m^2/s^3

There are lots more equivalencies that can be discerned directly from
the physics of the factor label metric system. TAKE PHYSICS!!

-Steve
--
-Steve Walz rstevew@armory.com ftp://ftp.armory.com/pub/user/rstevew
Electronics Site!! 1000's of Files and Dirs!! With Schematics Galore!!
http://www.armory.com/~rstevew or http://www.armory.com/~rstevew/Public
Click to expand...
Thanks to all who have provided me with meaningful answers that I can
ponder and look up further, to get more knowledge in the subject.

I have recently purchased what I feel is an excellent book, written
'at my level'. The book is: "Basic Electricity" by Van Valkenburgh,
Nooger & Neville, Inc.

I may come across something in the book I don't understand, and
therefore post my question(s) here.

I'm actually overwhelmed at the number of responses, and insightful
info, my thread generated.

Thanks,
George
 
"Uwe Bonnes" <bon@elektron.ikp.physik.tu-darmstadt.de> wrote in message
news:cia5ie$2qb$1@lnx107.hrz.tu-darmstadt.de...
Uwe Hercksen <hercksen@mew.uni-erlangen.de> wrote:


: Uwe Bonnes schrieb:
:
: > The human body consumes an equivalent of about 200 Watt...
:
: Hello,

: at rest, it is only 70 to 100 W.
: But Lance Armstrong may consume up to 1800 W.

Oops: 2000 kCal/day * 4.2 Ws/Cal /24 h/day / 60 min/hour /60 s/min
is around 100 Watt.
Click to expand...
1 horse = 7.5 men. Sounds about right.
 
On Thu, 16 Sep 2004 03:08:02 GMT, George wrote:

On Wed, 15 Sep 2004 13:57:09 GMT, Bob Stephens
stephensyomamadigital@earthlink.net> wrote:

On Wed, 15 Sep 2004 01:05:34 GMT, R. Steve Walz wrote:

There are lots more equivalencies that can be discerned directly from
the physics of the factor label metric system. TAKE PHYSICS!!

He probably *IS* taking physics. Hence his curiosity.
Having seen all the formulae, definitions and equations he can stand, he
wants something he can hang his hat on to give a conceptual understanding
of the magnitude of the entities he's dealing with.

Bob

What a horrible and totally mis-led exaggeration you imagine.
There are doctors for that.

I take what you've implied as slanderous, against me.
And for what?

If that's how you want to respond to any more questions I post,
then stay out of my threads.

But, I guess if that's the most intelligent response you can offer my
question, that you otherwise come to this ng to see the spammed porn
ads. I imagine there are doctors for that too,
Click to expand...
WTF???
 
Bob Stephens wrote:

WTF???
Click to expand...

I'll second that.

I'm guessing it was supposed to be in reply to someone else, but the
wrong message was replied to.


-Ed



--
(You can't go wrong with psycho-rats.) (er258)(@)(eng.cam)(.ac.uk)

/d{def}def/f{/Times findfont s scalefont setfont}d/s{10}d/r{roll}d f 5/m
{moveto}d -1 r 230 350 m 0 1 179{1 index show 88 rotate 4 mul 0 rmoveto}
for /s 15 d f pop 240 420 m 0 1 3 { 4 2 1 r sub -1 r show } for showpage
 
I'm still scratching my head over this as well.

Cheers!

Sir Charles W. Shults III, K. B. B.
Xenotech Research
321-206-1840
 
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