kilowatt-hour or megajoule

[Tim923]

Is it more direct to measure kilowatt-hours than megajoules? Is that
why kilowatt-hour is more common?

-
http://mysite.verizon.net/vze8adrh/news.html (profile) --Tim923 My email is valid.

 

[Don Kelly]

No- It is just that historically power is measured in watts and still is.
Hence the use of kWh was adopted for energy. This predated the use of the
"Joule" as a standard energy measure and industry has stuck with it.

In many places the horsepower is not used - kW is used instead. Joules are
used for heat energy but the US still uses Therms. Be thankful you are not
using a stone-furlong -fortnight set of units.

Don Kelly
dhky@peeshaw.ca
remove the urine to answer

"Tim923" <juggler923@verizon.net> wrote in message
newskk3n05s6gmdrf1euf6kda745dcrmm3cn3@4ax.com...

Is it more direct to measure kilowatt-hours than megajoules? Is that
why kilowatt-hour is more common?

-
http://mysite.verizon.net/vze8adrh/news.html (profile) --Tim923 My email
is valid.

 

[Rich Grise]

On Sun, 17 Oct 2004 04:21:03 +0000, Don Kelly top-posted:

No- It is just that historically power is measured in watts and still is.
Hence the use of kWh was adopted for energy. This predated the use of the
"Joule" as a standard energy measure and industry has stuck with it.

In many places the horsepower is not used - kW is used instead. Joules are
used for heat energy but the US still uses Therms. Be thankful you are not
using a stone-furlong -fortnight set of units.

"Tim923" <juggler923@verizon.net> wrote in message
Is it more direct to measure kilowatt-hours than megajoules? Is that
why kilowatt-hour is more common?

I read recently that some city specified wheelchair ramps in centimeters
rise per foot horizontal.

Cheers!
Rich

 

[Rich Grise]

On Mon, 18 Oct 2004 11:32:24 -0700, JeffM wrote:

some city specified wheelchair ramps in centimeters rise per foot horizontal
Rich Grise

in Australia car tyres have the rim diameter in inches
and the tread width in millimetres.
John G

We call them tires, but yeah, same here.
How about eye tests? 20/20 vision == 20mm characters readable @ 20 feet.

Well, no, actually, that means that at 20 feet, you can resolve what
"normal" eyes can resolve at 20 feet. 20/200 means that at 20 feet,
the letters have to be so big for you to resolve them, that they're
the size that normal eyes can resolve from 200 feet, and so on.

At least, that's what they taught me, back when schools actually
taught stuff. ;-)

Cheers!
Rich

 

[John G]

"Rich Grise" <rich@example.net> wrote in message
newsan.2004.10.18.05.05.34.528673@example.net...

On Sun, 17 Oct 2004 04:21:03 +0000, Don Kelly top-posted:

No- It is just that historically power is measured in watts and
still is.
Hence the use of kWh was adopted for energy. This predated the use
of the
"Joule" as a standard energy measure and industry has stuck with
it.

In many places the horsepower is not used - kW is used instead.
Joules are
used for heat energy but the US still uses Therms. Be thankful you
are not
using a stone-furlong -fortnight set of units.

"Tim923" <juggler923@verizon.net> wrote in message
Is it more direct to measure kilowatt-hours than megajoules? Is
that
why kilowatt-hour is more common?

I read recently that some city specified wheelchair ramps in
centimeters
rise per foot horizontal.

Cheers!
Rich

I do not know about the US but in Australia car tyres have the rim
diameter in inches and the tread width in millimetres.
This is a multicultural nation!!
--
John G

Wot's Your Real Problem?

 

[JeffM]

some city specified wheelchair ramps in centimeters rise per foot horizontal
Rich Grise

in Australia car tyres have the rim diameter in inches
and the tread width in millimetres.
John G

We call them tires, but yeah, same here.
How about eye tests? 20/20 vision == 20mm characters readable @ 20 feet.

 

[William J. Beaty]

Tim923 <juggler923@verizon.net> wrote in message news:<okk3n05s6gmdrf1euf6kda745dcrmm3cn3@4ax.com>...

Is it more direct to measure kilowatt-hours than megajoules? Is that
why kilowatt-hour is more common?

Is it more direct to measure yards than meters? Or more direct
to measure pounds than kilograms? Answer: no.


Also: (heh) is quantity of electricity measured in coulombs... or joules?


And just how large is a coulomb, in millimeters? About 0.4mm!

For mobile electrons in copper wires, there are around 8.5e22 electrons
per cm^3, and 1.6e-19 coulombs per electron, gives 13600 coulombs per cc,
so each coulomb is about 0.04cm across!

http://amasci.com/miscon/speed.html

 

[tlbs101]

billb@eskimo.com (William J. Beaty) wrote in message news:<2251b4e6.0410181214.5d75371@posting.google.com>...

Tim923 <juggler923@verizon.net> wrote in message news:<okk3n05s6gmdrf1euf6kda745dcrmm3cn3@4ax.com>...

Is it more direct to measure kilowatt-hours than megajoules? Is that
why kilowatt-hour is more common?


Is it more direct to measure yards than meters? Or more direct
to measure pounds than kilograms? Answer: no.


Also: (heh) is quantity of electricity measured in coulombs... or joules?


And just how large is a coulomb, in millimeters? About 0.4mm!

For mobile electrons in copper wires, there are around 8.5e22 electrons
per cm^3, and 1.6e-19 coulombs per electron, gives 13600 coulombs per cc,
so each coulomb is about 0.04cm across!

http://amasci.com/miscon/speed.html

I always wondered why they couldn't have set a Coulomb equal to a Mole
of charge. Either that or create a new electrical unit of charge
equal to a Mole of charge -- how about the Heavi (for Heaviside).