:''This article is about the SI derived unit. For the scientist, see Georg Ohm.'' The ohm is the SI SI derived unit of electrical resistance (derived from the ampere and the watt). Its symbol is the Greek alphabet capital letter omega (letter) (Ω). The ohm is named for Georg Ohm, a Germany physics who discovered the relation between voltage and current (electricity), expressed in Ohm's Law. By definition from Ohm's Law, a device has a resistance of one ohm if a voltage of one volt will cause a current of one ampere to flow (''R = V/I''). Alternatively and equivalently, a device that dissipates one watt of power with one ampere of current flowing through it has a resistance of one ohm (''R = P/I''2). One thousand ohms is called a kilohm or kiloohm, and abbreviated kΩ. One million ohms is called a megohm or megaohm, and abbreviated MΩ. Other orders of magnitude follow standard SI conventions, and the last letter of the prefix is rarely omitted. A measurement in ohms is the reciprocal of a measurement in siemens (unit), the SI unit of electrical conductance. Note that 'siemens' is both singular and plural. The reciprocal of the ohm is also called the mho, from ''ohm'' written backwards. The complex number quantity impedance is a generalisation of resistance. Its real part is resistance and its imaginary part is reactance. For consistency, impedance, resistance and reactance all have units of ohms. The ohm is since 1990 maintained internationally using the quantum Hall effect, where a conventional value is used for the 'Klaus von Klitzing constant', fixed by the 18th CGPM as R{K-90} = 25812.807 Ω. ==SI electricity units== ==See also== *Ohm's Law *[http://www.fh-nuernberg.de/institutionen/bibliothek/bibsuche/texte_online_aufrufen/historische_buecher_der_gso_fh/werke_von_georg_simon_ohm/ Scanned books of Georg Simon Ohm at the library of the University of Applied Sciences Nuremberg] ''For the Hindu mantra syllable, see aum.'' SI derived units Units of electrical resistance
== ohm symbol == do we really need 3 ohm characters? User:PeregrineAY 02:34, 2005 Apr 6 (UTC) :No, but we need the right one. Unless I got confused by the two sets of comments, it looked like you kept the wrong one to display. I left the comment there for future editors, but rearranged into just one. There is probably no difference between using the first listed, they should both map to the same character. User:Gene Nygaard 04:00, 6 Apr 2005 (UTC) ::Is there such thing as a 'right' one? I am wondering if all users can see &*omega; and if the other ones, 937 and 8486, would be better for all wikipedians to use. User:PeregrineAY 07:50, 2005 Apr 6 (UTC) :::There is such a thing as a wrong one. #8486 or #x2126 is the Unicode character is in a group of characters whose only purpose is to enable accurate rendition in Unicode of text originally formatted in a certain few code pages in a certain few Asian languages. It is not for use in new writing in any language, and certainly not in English. :::There have been times when some browsers will support a named character and not support it numerical equivalent, or vice versa. I don't think that is a problem at all in regards to the basic Greek characters, though it still does matter for some other more obscure characters. I don't think it makes any difference if you use ω or Ω or Ω as they should all show up as exactly the same character. Here they are, side by side--increase the text size in your browser and compare them: ΩΩΩ
:::This way, if anybody's browser doesn't show all three of them, and all the same, they can let us know. User:Gene Nygaard 13:01, 6 Apr 2005 (UTC) == Kilohm or kiloohms == I have edited this part on the basis of the following Google hits kilohm OR kilohms 12,300 kiloohm OR kiloohms 7,180 "kilo-ohm" 6,350 "kilo-ohms" 5,470 megaohm OR megaohms 22,600 megohm OR megohms 92,900 gigaohm OR gigaohms 7,680 gigohm OR gigohms 1,250 teraohm OR teraohms 1,350 terohm OR terohms 40 kiloohm OR kiloohms site:bipm.org 3 kilohm OR kilohms site:bipm.org 0 kiloohm OR kiloohms site:nist.gov 2 kilohm OR kilohms site:nist.gov 18 User:Gene Nygaard 05:43, 18 Dec 2004 (UTC) :Just because everyone spells something wrong doesn't mean it's not wrong. That said, "The simplified spelling kilohm is approved by the Institute of Electrical and Electronics Engineers (IEEE)" and SI standard seems to be kiloohm, so they're both acceptable. - User:Omegatron 18:26, Dec 18, 2004 (UTC)
See other meanings of words starting from letter:
Words begining with Ohm:
Ohm
Ohm
Ohm's_Law
Ohm's_Law
Ohm's_law
Ohm's_law
Ohmeter
Ohmic_device
Ohmmeter
OHMR
Ohms
Ohmss
Ohms_Law
Ohms_law
OhMyNews
OhmyNews
OhmyNews
Ohmynews
Ohmynews
Ohm_(crater)
Ohm_Law
Ohm
:''This article is about the SI derived unit. For the scientist, see Georg Ohm.'' The ohm is the SI SI derived unit of electrical resistance (derived from the ampere and the watt). Its symbol is the Greek alphabet capital letter omega (letter) (Ω). The ohm is named for Georg Ohm, a Germany physics who discovered the relation between voltage and current (electricity), expressed in Ohm's Law. By definition from Ohm's Law, a device has a resistance of one ohm if a voltage of one volt will cause a current of one ampere to flow (''R = V/I''). Alternatively and equivalently, a device that dissipates one watt of power with one ampere of current flowing through it has a resistance of one ohm (''R = P/I''2). One thousand ohms is called a kilohm or kiloohm, and abbreviated kΩ. One million ohms is called a megohm or megaohm, and abbreviated MΩ. Other orders of magnitude follow standard SI conventions, and the last letter of the prefix is rarely omitted. A measurement in ohms is the reciprocal of a measurement in siemens (unit), the SI unit of electrical conductance. Note that 'siemens' is both singular and plural. The reciprocal of the ohm is also called the mho, from ''ohm'' written backwards. The complex number quantity impedance is a generalisation of resistance. Its real part is resistance and its imaginary part is reactance. For consistency, impedance, resistance and reactance all have units of ohms. The ohm is since 1990 maintained internationally using the quantum Hall effect, where a conventional value is used for the 'Klaus von Klitzing constant', fixed by the 18th CGPM as R{K-90} = 25812.807 Ω. ==SI electricity units== ==See also== *Ohm's Law *[http://www.fh-nuernberg.de/institutionen/bibliothek/bibsuche/texte_online_aufrufen/historische_buecher_der_gso_fh/werke_von_georg_simon_ohm/ Scanned books of Georg Simon Ohm at the library of the University of Applied Sciences Nuremberg] ''For the Hindu mantra syllable, see aum.'' SI derived units Units of electrical resistance
Ohm
== ohm symbol == do we really need 3 ohm characters? User:PeregrineAY 02:34, 2005 Apr 6 (UTC) :No, but we need the right one. Unless I got confused by the two sets of comments, it looked like you kept the wrong one to display. I left the comment there for future editors, but rearranged into just one. There is probably no difference between using the first listed, they should both map to the same character. User:Gene Nygaard 04:00, 6 Apr 2005 (UTC) ::Is there such thing as a 'right' one? I am wondering if all users can see &*omega; and if the other ones, 937 and 8486, would be better for all wikipedians to use. User:PeregrineAY 07:50, 2005 Apr 6 (UTC) :::There is such a thing as a wrong one. #8486 or #x2126 is the Unicode character is in a group of characters whose only purpose is to enable accurate rendition in Unicode of text originally formatted in a certain few code pages in a certain few Asian languages. It is not for use in new writing in any language, and certainly not in English. :::There have been times when some browsers will support a named character and not support it numerical equivalent, or vice versa. I don't think that is a problem at all in regards to the basic Greek characters, though it still does matter for some other more obscure characters. I don't think it makes any difference if you use ω or Ω or Ω as they should all show up as exactly the same character. Here they are, side by side--increase the text size in your browser and compare them: ΩΩΩ
:::This way, if anybody's browser doesn't show all three of them, and all the same, they can let us know. User:Gene Nygaard 13:01, 6 Apr 2005 (UTC) == Kilohm or kiloohms == I have edited this part on the basis of the following Google hits kilohm OR kilohms 12,300 kiloohm OR kiloohms 7,180 "kilo-ohm" 6,350 "kilo-ohms" 5,470 megaohm OR megaohms 22,600 megohm OR megohms 92,900 gigaohm OR gigaohms 7,680 gigohm OR gigohms 1,250 teraohm OR teraohms 1,350 terohm OR terohms 40 kiloohm OR kiloohms site:bipm.org 3 kilohm OR kilohms site:bipm.org 0 kiloohm OR kiloohms site:nist.gov 2 kilohm OR kilohms site:nist.gov 18 User:Gene Nygaard 05:43, 18 Dec 2004 (UTC) :Just because everyone spells something wrong doesn't mean it's not wrong. That said, "The simplified spelling kilohm is approved by the Institute of Electrical and Electronics Engineers (IEEE)" and SI standard seems to be kiloohm, so they're both acceptable. - User:Omegatron 18:26, Dec 18, 2004 (UTC)
See other meanings of words starting from letter:
O
OA | OB | OC | OD | OE | OF | OG | OH | OI | OJ | OK | OL | OM | ON | OP | OR | OS | OT | OU | OW | OX | OY | OZ |Words begining with Ohm:
Ohm
Ohm
Ohm's_Law
Ohm's_Law
Ohm's_law
Ohm's_law
Ohmeter
Ohmic_device
Ohmmeter
OHMR
Ohms
Ohmss
Ohms_Law
Ohms_law
OhMyNews
OhmyNews
OhmyNews
Ohmynews
Ohmynews
Ohm_(crater)
Ohm_Law
These materials are based on Wikipedia and licensed under the GNU FDL
YouTube.com videos better site than Turbo Tax 2007
