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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’ Flex-Plants™ - Flexible Combined Cycle Power Generation
Siemens’ Flex-Plants™ - Flexible Combined Cycle Power Generation
Published: 2016/07/19
Channel: Siemens
Siemens 5SM6 AFD units
Siemens 5SM6 AFD units
Published: 2015/08/06
Channel: Siemens
Siemens and alstom rail train units merge as corporations prepare for trade war
Siemens and alstom rail train units merge as corporations prepare for trade war
Published: 2017/10/06
Channel: Gesundheitsblatt 365
Adding Animation to a Siemens HMI - Unit 22.1
Adding Animation to a Siemens HMI - Unit 22.1
Published: 2017/04/21
Channel: KletteTech
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
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
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 Futuristic Logo Animation played on Hologram unit
Siemens Futuristic Logo Animation played on Hologram unit
Published: 2016/12/14
Channel: Social Dav
Siemens 6EV3055-ODC Sinumerik CNC Unit Repairs @ Advanced Micro Services Pvt. Ltd
Siemens 6EV3055-ODC Sinumerik CNC Unit Repairs @ Advanced Micro Services Pvt. Ltd
Published: 2013/12/11
Channel: AMSPL BLR
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
Programming Multiple Screens onto a Siemens HMI - Unit 20.1
Programming Multiple Screens onto a Siemens HMI - Unit 20.1
Published: 2017/04/03
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 unit 667 headed east 01mar16
Siemens unit 667 headed east 01mar16
Published: 2016/03/01
Channel: Sky Rider
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
Siemens Unit Unjector BIP and BIP Voltage measurement
Siemens Unit Unjector BIP and BIP Voltage measurement
Published: 2017/12/10
Channel: Recon Diesel
BenQ chairman on Siemens unit purchase
BenQ chairman on Siemens unit purchase
Published: 2015/07/21
Channel: AP Archive
Siemens Unit Unjector BIP and Voltage measurement
Siemens Unit Unjector BIP and Voltage measurement
Published: 2017/12/04
Channel: Piotr Mosioł
Siemens healthcare unit IPO next year
Siemens healthcare unit IPO next year
Published: 2018/01/02
Channel: Times of Oman
Iberdrola CEO Says
Iberdrola CEO Says 'Concerned' by Siemens' Gamesa Unit
Published: 2018/01/09
Channel: Bloomberg TV Markets and Finance
Siemens 2 Unit Injectors test on Cambox 550/2
Siemens 2 Unit Injectors test on Cambox 550/2
Published: 2018/01/19
Channel: Recon Diesel
FLENDER SIP planetary gear unit from Siemens
FLENDER SIP planetary gear unit from Siemens
Published: 2014/04/15
Channel: Siemens
Siemens GIS NXPlusC circuit-breaker panel
Siemens GIS NXPlusC circuit-breaker panel
Published: 2012/08/01
Channel: Siemens
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
(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 Repair Unit at Villena
Siemens Repair Unit at Villena
Published: 2017/05/11
Channel: trains
Siemens - Proper Handling of Siemens Detector Cooling Unit
Siemens - Proper Handling of Siemens Detector Cooling Unit
Published: 2017/07/19
Channel: Technical Prospects
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 Should Keep Majority If Healthcare Unit Floated-union
Siemens Should Keep Majority If Healthcare Unit Floated-union
Published: 2014/11/09
Channel: Wochit Business
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  TP27   MONITOR  USED  UNIT
SIEMENS TP27 MONITOR USED UNIT
Published: 2017/02/28
Channel: FA VINNATECH
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
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
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
Bidders line up for Siemens postal machines unit
Bidders line up for Siemens postal machines unit
Published: 2013/07/11
Channel: Wochit Business
Programming an OR Circuit with the Siemens TIA Portal V14 - Unit 10
Programming an OR Circuit with the Siemens TIA Portal V14 - Unit 10
Published: 2017/03/10
Channel: KletteTech
Siemens Charger Demo Unit on Amtrak P950
Siemens Charger Demo Unit on Amtrak P950
Published: 2017/05/29
Channel: PereMarquette1223
Siemens new style Vehicle digi-tacho unit.
Siemens new style Vehicle digi-tacho unit.
Published: 2012/10/27
Channel: Aliensonmotorbikes
Quality Assurance - Siemens Kluever Cooling Units
Quality Assurance - Siemens Kluever Cooling Units
Published: 2017/06/14
Channel: Technical Prospects
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
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
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
SIEMENS SIBCOS M1300 MASTER CONTROL UNIT REPAIRS@ Advanced Micro Services Pvt. Ltd
SIEMENS SIBCOS M1300 MASTER CONTROL UNIT REPAIRS@ Advanced Micro Services Pvt. Ltd
Published: 2014/03/07
Channel: AMSPL BLR
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
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 - CPU MODULE S5-95U COMPACT UNIT 6ES5-095-8MA03  Repaired at Synchronics
Siemens - CPU MODULE S5-95U COMPACT UNIT 6ES5-095-8MA03 Repaired at Synchronics
Published: 2015/02/02
Channel: Synchronics Electronics Pvt. Ltd.
Siemens 6ES7 216-2AD23-0XB8 CPU 226 CN Unit Repairs @ Advanced Micro Services Pvt,Ltd
Siemens 6ES7 216-2AD23-0XB8 CPU 226 CN Unit Repairs @ Advanced Micro Services Pvt,Ltd
Published: 2016/05/06
Channel: AMSPL BLR
Siemens - Handwheel Unit HHV HTL Machine Repaired at Synchronics
Siemens - Handwheel Unit HHV HTL Machine Repaired at Synchronics
Published: 2015/02/02
Channel: Synchronics Electronics Pvt. Ltd.
Siemens - Sinamics Control Unit CU320 6Sl3040-0MA00-0AA1 Repaired at Synchronics
Siemens - Sinamics Control Unit CU320 6Sl3040-0MA00-0AA1 Repaired at Synchronics
Published: 2015/01/29
Channel: Synchronics Electronics Pvt. Ltd.
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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]

A name that is used as an alternative to for the siemens is the mho /m/, the reciprocal of one ohm. It is derived from spelling ohm backwards 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]

NIST's Guide for the Use of the International System of Units (SI) refers to the mho as an "unaccepted special name for an SI unit", and indicates that it should be strictly avoided.[4]

The SI term siemens is used universally in science and often in electrical applications, while mho is still used in some electronic contexts. The inverted capital omega symbol, while not an official SI abbreviation, is 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.[5] So, for example, a pentode’s transconductance of 2.2 mS might alternatively be written as 2.2 or 2200 (most common in the 1930s) or 2.2 mA/V.

Notes and references[edit]

  1. ^ NIST Guide to the SI, Chapter 9: Rules and Style Conventions for Spelling Unit Names, National Institute of Standards and Technology, 2008, retrieved 2017-12-22 
  2. ^ Maver, William: American Telegraphy and Encyclopedia of the Telegraph: Systems, Apparatus, Operation. 1903.
  3. ^ http://www.tech-faq.com/siemens.html
  4. ^ NIST Guide to the SI, Chapter 5: Units Outside the SI, National Institute of Standards and Technology, 2008, retrieved 2017-12-22 
  5. ^ 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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