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Those pesky Abbreviations!
Those pesky Abbreviations!
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Old 29th August 2021, 03:21 PM   #11
jean-paul is offline jean-paul  Netherlands
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What I have understood over the years is that Ohms Law is law nr. 1 for any person having the electro tic. Strange is that even though it was hammered in our brains during education we never learned the Ohm's Law triangle.

Quote:
Originally Posted by rif View Post
!n argument can be made that Centigrade is far more useful than Celsius.
Had to think that one over but I agree. It would be an exception though (but the world is full of those). For some reason most always mention "degrees" together with "Celsius" while normally one would/should say "20 Celsius" just like "20 Volt". For some reason "20 Centigrade" sounds more practical.
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Old 29th August 2021, 03:39 PM   #12
Enzo is offline Enzo  United States
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WHen I was learning, Ohm's Law was E=IxR E for "electromotive force".

These days I try always to use V, but in my own bench scribbling I still sometimes write E there.

At some point they decided everything had to have a commemorative name. I learned cps (cycles per second) for AC signals. Very descriptive, hard to misunderstand. Then one day they decided cps was to become Hertz. I eventually managed to teach myself to use that term, but to this day I will say "Apply a 400 cycle tone to the input..." Or "the hum was 60 cycle."

micro-microfarads became picofarads. Now we have nanofarads. As I am retired it is unlikely I will ever adapt to using that term. I understand it, but in my mind forever it will be 1000pf or 0.001uf. Never a nanofarad.
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Old 29th August 2021, 03:42 PM   #13
jean-paul is offline jean-paul  Netherlands
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All more or less US deviations from international standards.

U is voltage (in many languages described as "electrical tension"), E was for potential but it was abandoned it seems. V is the unit for Volts.

As many an error was made with capacitance (0.000000000047 farad = 47 picofarad) it was somehow agreed to use "value x 10-9" for nF and "value x 10-12" for pF etc. Never got around to think that was easier Even 30 years ago nF or nanofarad was standard lingo here in lab.
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Old 29th August 2021, 03:48 PM   #14
mbrennwa is offline mbrennwa  Switzerland
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Those pesky Abbreviations!
Quote:
Originally Posted by myleftear View Post
I find it hard to remember that, for example, the ampere (A) is referred to as I.
It is not. Two reasons:

(1) You can use any variable (or "letter") you like to indicate current, as long as the meaning of your variable is clear from the context. "I" is often used as the variable for current, but one should always define it's meaning. There is no universal notation that holds without definition of the variables.

(2) The ampere (A) is the SI unit of the current. There may be other units for current, and "ampere" is not the same as "current".
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Old 29th August 2021, 04:04 PM   #15
rif is offline rif  United States
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Those pesky Abbreviations!
Quote:
Originally Posted by jean-paul View Post
What I have understood over the years is that Ohms Law is law nr. 1 for any person having the electro tic. Strange is that even though it was hammered in our brains during education we never learned the Ohm's Law triangle.



Had to think that one over but I agree. It would be an exception though (but the world is full of those). For some reason most always mention "degrees" together with "Celsius" while normally one would/should say "20 Celsius" just like "20 Volt". For some reason "20 Centigrade" sounds more practical.
Centigrade is better, you can reason through it like this: centi =1/100 th of some something. When discussing temperature, the 2 most widely known marks are water freezing and boiling. So arbitrarily assign boiling to 100, freezing 0 and 100 graduations in between. Centigrade. Celsius just tells you some guys name.
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Old 29th August 2021, 04:20 PM   #16
Cal Weldon is offline Cal Weldon  Canada
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Those pesky Abbreviations!
We just say 20 degrees. I don’t know of anyone who adds the word Celsius. Rather than Centigrade, I agree we should keep it in honour of the man or it would behoove us to change Fahrenheit to the ‘Makesnosense’ scale.
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Old 29th August 2021, 05:01 PM   #17
Pano is offline Pano  United States
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Those pesky Abbreviations!
Makes perfect sense to me. 180 degrees from water freezing to water boiling. 180. hmm, where have we seen that before?
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Old 29th August 2021, 05:11 PM   #18
myleftear is offline myleftear  Switzerland
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Those pesky Abbreviations!
ok, this seems quite apparently logic, and the F becomes accessible.

It is in fact the conversion from F - C that is an utter mess, so much that us from Celsus-lands think the unit was a mess. (And vice versa probably the same)
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Old 29th August 2021, 05:40 PM   #19
Cal Weldon is offline Cal Weldon  Canada
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Pano, I don't believe any of the hooey you can read on it. His supporters tried to cover up the fact that he made a thermometer, put the numbers on it and then discovered where water froze and boiled. They even had to concoct something about different salt solutions to make any sense of it. The 180 was nothing more than a convenient resulting afterthought. OTOH, the smart guy chose to put the numbers on his thermometer after he tried it out. A scale of 0-100 makes a lot of sense in a world that uses the decimal system. F is only used in one major country of the world and that's still a bit of a mystery don't you think?
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Old 29th August 2021, 06:23 PM   #20
myleftear is offline myleftear  Switzerland
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Those pesky Abbreviations!
I just lookes it up on wikipedia. It unfortunately is way more complicated (to me)
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