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Siemens (unit)
Siemens (unit)
Published: 2014/11/05
Channel: Audiopedia
Siemens 5SM6 AFD units
Siemens 5SM6 AFD units
Published: 2015/08/06
Channel: Siemens
Siemens (unit)
Siemens (unit)
Published: 2016/01/22
Channel: WikiAudio
Controlling and Displaying a Timer on a Siemens HMI - Unit 15.1
Controlling and Displaying a Timer on a Siemens HMI - Unit 15.1
Published: 2017/03/20
Channel: KletteTech
FLENDER SIP planetary gear unit from Siemens
FLENDER SIP planetary gear unit from Siemens
Published: 2014/04/15
Channel: Siemens
Siemens EQ.5 Brüheinheit reinigen
Siemens EQ.5 Brüheinheit reinigen
Published: 2015/05/24
Channel: Miihi S
Siemens Luminos Agile - Fluoroscopy & Radiography Systems Testimonial
Siemens Luminos Agile - Fluoroscopy & Radiography Systems Testimonial
Published: 2012/11/12
Channel: Siemens
How to use Siemens DTCO 1381 Digital Tachograph unit Part 1
How to use Siemens DTCO 1381 Digital Tachograph unit Part 1
Published: 2016/06/23
Channel: flamedlotus
Siemens ET200s - how to add or remove modules
Siemens ET200s - how to add or remove modules
Published: 2013/10/14
Channel: natenut
Creating Tags for Inputs and Outputs on the Siemens PLC - Unit 6
Creating Tags for Inputs and Outputs on the Siemens PLC - Unit 6
Published: 2017/02/25
Channel: KletteTech
Siemens Repair Unit at Villena
Siemens Repair Unit at Villena
Published: 2017/05/11
Channel: trains
Creating a Start Stop Station on an Siemens HMI - Unit 14.1
Creating a Start Stop Station on an Siemens HMI - Unit 14.1
Published: 2017/03/20
Channel: KletteTech
Siemens new style Vehicle digi-tacho unit.
Siemens new style Vehicle digi-tacho unit.
Published: 2012/10/27
Channel: Aliensonmotorbikes
Siemens Meaning
Siemens Meaning
Published: 2015/04/13
Channel: SDictionary
How to use Siemens DTCO 1381 Digital Tachograph unit PART 3
How to use Siemens DTCO 1381 Digital Tachograph unit PART 3
Published: 2016/06/23
Channel: flamedlotus
Parallel resistance vid 1 conductance mhos siemens introduction w multimeter and ohms law
Parallel resistance vid 1 conductance mhos siemens introduction w multimeter and ohms law
Published: 2017/01/23
Channel: electronzapdotcom
Amtrak (Test Train) P960 with the new Siemens Unit in Lapeer Michigan.
Amtrak (Test Train) P960 with the new Siemens Unit in Lapeer Michigan.
Published: 2017/05/04
Channel: United Railfan Photos
Controlling and Monitoring a Counter with a Siemens HMI using TIA Portal V14 - Unit 18.1
Controlling and Monitoring a Counter with a Siemens HMI using TIA Portal V14 - Unit 18.1
Published: 2017/03/27
Channel: KletteTech
Networking the PLC and the HMI in Siemens TIA Portal V14 - Unit 5.1
Networking the PLC and the HMI in Siemens TIA Portal V14 - Unit 5.1
Published: 2017/02/25
Channel: KletteTech
Siemens CU320 & S120 Sinamics Drive Setup in Starter.
Siemens CU320 & S120 Sinamics Drive Setup in Starter.
Published: 2012/08/29
Channel: KGBSystems
Amtrak Siemens 600 & Amtrak Siemens Veterans Unit 642 Electric Locomotives
Amtrak Siemens 600 & Amtrak Siemens Veterans Unit 642 Electric Locomotives
Published: 2017/08/17
Channel: Elijah Trofort
Siemens TE706209RW EQ 7 Plus
Siemens TE706209RW EQ 7 Plus
Published: 2012/08/31
Channel: Coolblue
BenQ chairman on Siemens unit purchase
BenQ chairman on Siemens unit purchase
Published: 2015/07/21
Channel: AP Archive
Siemens 3NP1 Fuse Switch Disconnectors
Siemens 3NP1 Fuse Switch Disconnectors
Published: 2015/10/27
Channel: Siemens
Siemens EQ.9 s700 - Brüheinheit reinigen
Siemens EQ.9 s700 - Brüheinheit reinigen
Published: 2016/04/06
Channel: Frank Feil
How to use Siemens DTCO 1381 Digital Tachograph unit PART 2
How to use Siemens DTCO 1381 Digital Tachograph unit PART 2
Published: 2016/06/23
Channel: flamedlotus
How to use Siemens DTCO 1381 Digital Tachograph unit PART 4
How to use Siemens DTCO 1381 Digital Tachograph unit PART 4
Published: 2016/06/23
Channel: flamedlotus
Siemens unit 667 headed east 01mar16
Siemens unit 667 headed east 01mar16
Published: 2016/03/01
Channel: Sky Rider
(PART 4) understanding breaks on the VDO SIEMENS digital tachograph unit fitted to HGVs / lorries
(PART 4) understanding breaks on the VDO SIEMENS digital tachograph unit fitted to HGVs / lorries
Published: 2017/06/15
Channel: Trucker Dave
SIEMENS Charger Unit Test Train, UP C40-8W - Railfanning Eugene, OR 2-18-17!
SIEMENS Charger Unit Test Train, UP C40-8W - Railfanning Eugene, OR 2-18-17!
Published: 2017/06/22
Channel: America's Railfan
Adding Animation to a Siemens HMI - Unit 22.1
Adding Animation to a Siemens HMI - Unit 22.1
Published: 2017/04/21
Channel: KletteTech
How to use Siemens DTCO 1381 Digital Tachograph unit PART 5
How to use Siemens DTCO 1381 Digital Tachograph unit PART 5
Published: 2016/06/23
Channel: flamedlotus
Starting a New Siemens PLC Project - Unit 2
Starting a New Siemens PLC Project - Unit 2
Published: 2017/02/25
Channel: KletteTech
Bidders line up for Siemens postal machines unit
Bidders line up for Siemens postal machines unit
Published: 2013/07/11
Channel: Wochit Business
Siemens 6ES7 223-1BL22 PLC Unit Repairs @ Advanced Micro Services Pvt. Ltd
Siemens 6ES7 223-1BL22 PLC Unit Repairs @ Advanced Micro Services Pvt. Ltd
Published: 2014/10/22
Channel: AMSPL BLR
Heatwell Thermostat Programming Video for Siemens RDE100
Heatwell Thermostat Programming Video for Siemens RDE100
Published: 2013/10/14
Channel: Kiwiash Ash
Siemens 6EP1437-1SL11 SITOP Power 40 AMP Supply Unit Repairs @ Advanced Micro Services Pvt.Ltd
Siemens 6EP1437-1SL11 SITOP Power 40 AMP Supply Unit Repairs @ Advanced Micro Services Pvt.Ltd
Published: 2015/01/08
Channel: AMSPL BLR
Siemens 8DJH - Gas-insulated, metal-enclosed medium voltage (10kV) switchgear
Siemens 8DJH - Gas-insulated, metal-enclosed medium voltage (10kV) switchgear
Published: 2015/11/05
Channel: EnergyWorld24
Vendor of SIEMENS, Railway Digital Signal Cable With Screened Unit Manufacturer in China For Sale
Vendor of SIEMENS, Railway Digital Signal Cable With Screened Unit Manufacturer in China For Sale
Published: 2016/03/29
Channel: Wanbo Tianjin
Siemens - GS IN - TSS unit - All Hands Meet 2016 - Collaboration meet
Siemens - GS IN - TSS unit - All Hands Meet 2016 - Collaboration meet
Published: 2017/01/02
Channel: Reflections-i2we
Siemens Siremobil Compact C-Arm Vascular Unit
Siemens Siremobil Compact C-Arm Vascular Unit
Published: 2014/11/05
Channel: Gary Benitez
Siemens thermostat operation
Siemens thermostat operation
Published: 2015/05/15
Channel: JUST GAS LTD
How to fix Opel Astra and Zafira ECU / Siemens - GM Vauxhall 5WK9
How to fix Opel Astra and Zafira ECU / Siemens - GM Vauxhall 5WK9
Published: 2016/05/20
Channel: Bob. Kalpon
1+0 IDU SRAL XD Installation Tutorial Siemens
1+0 IDU SRAL XD Installation Tutorial Siemens
Published: 2016/06/29
Channel: Ahmad Mneimne
Siemens Repair Unit at Villena
Siemens Repair Unit at Villena
Published: 2017/04/17
Channel: trains
Siemens Should Keep Majority If Healthcare Unit Floated-union
Siemens Should Keep Majority If Healthcare Unit Floated-union
Published: 2014/11/09
Channel: Wochit Business
PD340 and Siemens F M MAG electromagnetic flow meter test run including PD210 display unit
PD340 and Siemens F M MAG electromagnetic flow meter test run including PD210 display unit
Published: 2013/02/12
Channel: Arun Jacob
228-222-009-002Z Топливный насос / Fuel Supply Unit Siemens VDO - BMW E46
228-222-009-002Z Топливный насос / Fuel Supply Unit Siemens VDO - BMW E46
Published: 2016/04/09
Channel: GetAlong.ru
Finance Latest News: Bidders Line up for Siemens Postal Machines Unit
Finance Latest News: Bidders Line up for Siemens Postal Machines Unit
Published: 2013/07/11
Channel: Wochit Business
RARE! New Amtrak Siemens Charger Units in Denver! Quick Video
RARE! New Amtrak Siemens Charger Units in Denver! Quick Video
Published: 2017/07/04
Channel: Metra160
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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Siemens
Unit system SI derived unit
Unit of Electric conductance
Symbol S (= Ω−1) 
Named after Ernst Werner von Siemens
In SI base units: kg−1m−2s3A2

The siemens (symbol: S) is the derived unit of electric conductance, electric susceptance and electric admittance in the International System of Units (SI). Conductance, susceptance, and admittance are the reciprocals of resistance, reactance, and impedance respectively; hence one siemens is equal to the reciprocal of one ohm, and is also referred to as the mho. The 14th General Conference on Weights and Measures approved the addition of the siemens as a derived unit in 1971.

The unit is named after Ernst Werner von Siemens. In English, the same form siemens is used both for the singular and plural.[1]

Definition[edit]

For a conducting or semiconducting element, electrical resistance R and electrical conductance G are defined as

where I is the electric current through the object and V is the voltage (electrical potential difference) across the object.

The unit siemens for the conductance G is defined by

where Ω is the ohm, A is the ampere, and V is the volt.

For a device with a conductance of one siemens, the electric current through the device will increase by one ampere for every increase of one volt of electric potential difference across the device.

The conductance of a resistor with a resistance of five ohms, for example, is (5 Ω)−1, which is equal to 200 mS.

Mho[edit]

An alternative name for the siemens is the mho /m/, the reciprocal of one ohm. It is derived from spelling ohm backwards (a semordnilap) and is written as an upside-down capital Greek letter omega: , Unicode symbol U+2127 (℧). According to Maver[2] the term mho was suggested by Sir William Thomson (Lord Kelvin). The mho was officially renamed to the siemens, replacing the old meaning of the "siemens unit", at a conference in 1881.[3]

The term siemens, as it is an SI term, is used universally in science and often in electrical applications, while mho is still used primarily in electronic applications. The inverted Omega, while not an official SI abbreviation, has the advantage of being less likely to be confused with a variable than the letter S when doing algebraic calculations by hand, where the usual typographical distinctions (such as italic for variables and Roman for unit names) are difficult to maintain. Likewise, it is difficult to distinguish the symbol S from the lower-case s where second is meant, potentially causing confusion.[4] So, for example, a pentode's transconductance of 2.2 mS might alternatively be written as 2.2 m℧ or 2200 micromhos (most common in the 1930s) or 2.2 mA/V.

Notes and references[edit]

  1. ^ NIST Guide to SI Units – 9 Rules and Style Conventions for Spelling Unit Names, National Institute of Standards and Technology
  2. ^ Maver, William: American Telegraphy and Encyclopedia of the Telegraph: Systems, Apparatus, Operation. 1903.
  3. ^ http://www.tech-faq.com/siemens.html
  4. ^ Eugene R. Weiner, Applications of Environmental Aquatic Chemistry: A Practical Guide, p. 109, CRC Press, 2013 ISBN 1439853320

External links[edit]

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