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Siemens (unit)
Siemens (unit)
Published: 2014/11/05
Channel: Audiopedia
Siemens (unit)
Siemens (unit)
Published: 2016/01/22
Channel: WikiAudio
Siemens 5SM6 AFD units
Siemens 5SM6 AFD units
Published: 2015/08/06
Channel: Siemens
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
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
Siemens GIS NXPlusC circuit-breaker panel
Siemens GIS NXPlusC circuit-breaker panel
Published: 2012/08/01
Channel: Siemens
Amtrak HD EXCLUSIVE 60fps: Siemens ACS-64 642 Veterans Unit First Day in Revenue Service 7/2/15
Amtrak HD EXCLUSIVE 60fps: Siemens ACS-64 642 Veterans Unit First Day in Revenue Service 7/2/15
Published: 2015/07/03
Channel: Fan Railer
Locating and Prepping a Siemens HMI in TIA Portal - Unit 3.1
Locating and Prepping a Siemens HMI in TIA Portal - Unit 3.1
Published: 2017/02/25
Channel: KletteTech
BenQ chairman on Siemens unit purchase
BenQ chairman on Siemens unit purchase
Published: 2015/07/21
Channel: AP Archive
FLENDER SIP planetary gear unit from Siemens
FLENDER SIP planetary gear unit from Siemens
Published: 2014/04/15
Channel: Siemens
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 Siremobil Compact L   C Arm X Ray Unit with 2 Monitors (18570)
Siemens Siremobil Compact L C Arm X Ray Unit with 2 Monitors (18570)
Published: 2017/11/14
Channel: Scopet Medical Solution Limited
Siemens - Proper Handling of Siemens Detector Cooling Unit
Siemens - Proper Handling of Siemens Detector Cooling Unit
Published: 2017/07/19
Channel: Technical Prospects
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
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
The Pin out of the engine control units  ECU Bosch + Siemens + Bosch + Continental v2 and v3
The Pin out of the engine control units ECU Bosch + Siemens + Bosch + Continental v2 and v3
Published: 2017/10/11
Channel: ecu repair
Adding Animation to a Siemens HMI - Unit 22.1
Adding Animation to a Siemens HMI - Unit 22.1
Published: 2017/04/21
Channel: KletteTech
Siemens Repair Unit at Villena
Siemens Repair Unit at Villena
Published: 2017/05/11
Channel: trains
Siemens Futuristic Logo Animation played on Hologram unit
Siemens Futuristic Logo Animation played on Hologram unit
Published: 2016/12/14
Channel: Social Dav
Bidders line up for Siemens postal machines unit
Bidders line up for Siemens postal machines unit
Published: 2013/07/11
Channel: Wochit Business
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
Video Interview with Thomas Zimmerman, CEO Digital Grid Business Unit, Siemens Energy
Video Interview with Thomas Zimmerman, CEO Digital Grid Business Unit, Siemens Energy
Published: 2017/10/20
Channel: Metering & Smart Energy International
Regular Testing Siemens 6SN1118-0NJ00-0AA1 SIMODRIVE 611 Universal Control Unit, 1-Axis
Regular Testing Siemens 6SN1118-0NJ00-0AA1 SIMODRIVE 611 Universal Control Unit, 1-Axis
Published: 2017/10/11
Channel: Testing
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
Starting a New Siemens PLC Project - Unit 2
Starting a New Siemens PLC Project - Unit 2
Published: 2017/02/25
Channel: KletteTech
Siemens unit 667 headed east 01mar16
Siemens unit 667 headed east 01mar16
Published: 2016/03/01
Channel: Sky Rider
Skoda - 1C0909601A Siemens 5WK32123 VW51 - 68HC08AZ32 Airbag control unit
Skoda - 1C0909601A Siemens 5WK32123 VW51 - 68HC08AZ32 Airbag control unit
Published: 2016/10/10
Channel: Maxidot AirbagReset
MR-based Biopsy with NORAS Post & Pillar Biopsy Unit on Siemens MR systems
MR-based Biopsy with NORAS Post & Pillar Biopsy Unit on Siemens MR systems
Published: 2014/03/16
Channel: NORASMRI
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
AMTRAK heritage, with new SIEMENS CHARGER SC-44 #4604 Demo unit. SC-44 info in notes.
AMTRAK heritage, with new SIEMENS CHARGER SC-44 #4604 Demo unit. SC-44 info in notes.
Published: 2016/08/10
Channel: jackmp294.5™
(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
Siemens 6FC5210-0DF22-0AA0 SINUMERIK CPU Card PCU 50 Unit Repairs @Advanced Micro Services Pvt.Ltd
Siemens 6FC5210-0DF22-0AA0 SINUMERIK CPU Card PCU 50 Unit Repairs @Advanced Micro Services Pvt.Ltd
Published: 2015/08/22
Channel: AMSPL BLR
News Update: Siemens Postpones Sale of Hearing-Aid Unit on Low Bids (NYSE:SI)
News Update: Siemens Postpones Sale of Hearing-Aid Unit on Low Bids (NYSE:SI)
Published: 2010/03/15
Channel: TradeTheTrend
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
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 new style Vehicle digi-tacho unit.
Siemens new style Vehicle digi-tacho unit.
Published: 2012/10/27
Channel: Aliensonmotorbikes
Siemens 6FC5253-6BX10-2AF0 Sinumerik PCU 50 Display Unit Repairs @ Advanced Micro Services Pvt.Ltd
Siemens 6FC5253-6BX10-2AF0 Sinumerik PCU 50 Display Unit Repairs @ Advanced Micro Services Pvt.Ltd
Published: 2015/01/22
Channel: AMSPL BLR
Brew Unit Brew Group with Handle Bosch  Siemens  Nivona  Melitta among others
Brew Unit Brew Group with Handle Bosch Siemens Nivona Melitta among others
Published: 2015/10/17
Channel: Toku
Siemens - Power Supply Unit TR-150 5V/15V/24VDC Repaired at Synchronics
Siemens - Power Supply Unit TR-150 5V/15V/24VDC Repaired at Synchronics
Published: 2015/02/02
Channel: Synchronics Electronics Pvt. Ltd.
Bloomberg
Bloomberg's Adewuya on Nokia Siemens's Motorola Unit Buy: Video
Published: 2012/03/23
Channel: Bloomberg
Siemens 6ES7322 1HF01 0AA0 PLC Unit Repairs @ Advanced Micro Services Pvt. Ltd,Bangalore,India
Siemens 6ES7322 1HF01 0AA0 PLC Unit Repairs @ Advanced Micro Services Pvt. Ltd,Bangalore,India
Published: 2014/11/12
Channel: AMSPL BLR
Siemens 6ES7216-2BD22-0XD0 PLC Unit Repairs @ Advanced Micro Services Pvt.Ltd,Bangalore,India
Siemens 6ES7216-2BD22-0XD0 PLC Unit Repairs @ Advanced Micro Services Pvt.Ltd,Bangalore,India
Published: 2016/03/28
Channel: AMSPL BLR
Siemens 6ES7216-2BD23-0XB8 CPU Unit Repairs @ Advanced Micro Services Pvt.Ltd,Bangalore,India
Siemens 6ES7216-2BD23-0XB8 CPU Unit Repairs @ Advanced Micro Services Pvt.Ltd,Bangalore,India
Published: 2015/06/25
Channel: AMSPL BLR
Siemens 6ES7 322 1BL00-0AA0 SIMATIC 87 PLC Unit Repairs @ Advanced Micro Services Pvt. Ltd
Siemens 6ES7 322 1BL00-0AA0 SIMATIC 87 PLC Unit Repairs @ Advanced Micro Services Pvt. Ltd
Published: 2014/07/04
Channel: AMSPL BLR
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
Unit Testing and TDD: Why you should care and how to make it happen
Unit Testing and TDD: Why you should care and how to make it happen
Published: 2013/10/16
Channel: Roy Osherove
Siemens demonstrating the digital future with 2 DDPS units
Siemens demonstrating the digital future with 2 DDPS units
Published: 2017/07/25
Channel: DeDietrichProcess
Siemens -  M83RO18DSXD - 75 GPM Brackish RO Unit
Siemens - M83RO18DSXD - 75 GPM Brackish RO Unit
Published: 2014/01/21
Channel: SMWaterSurplus
Siemens 6ES7 223-1BL22-0XA8 PLC Unit Repairs @ Advanced Micro Services Pvt.Ltd,Bangalore,India
Siemens 6ES7 223-1BL22-0XA8 PLC Unit Repairs @ Advanced Micro Services Pvt.Ltd,Bangalore,India
Published: 2016/05/06
Channel: AMSPL BLR
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WIKIPEDIA ARTICLE

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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 redundantly 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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