The siemens (SI unit symbol: S) is the unit of electric conductance and electric admittance in the International System of Units (SI). Its symbol, "S" (upper case), should not be confused with the SI symbol "s" (lower case) which is used for second. Conductance and admittance are the reciprocals of resistance 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. As with every SI unit whose name is derived from the proper name of a person, the first letter of its symbol is upper case (S). When an SI unit is spelled out in English, it should always begin with a lower case letter (siemens), except where any word would be capitalized.^[1] In English, the same form siemens is used both for the singular and plural.^[2]

Definition[link]

For a conducting or semiconducting element with electrical resistance R, the conductance, G, is defined as

Failed to parse (Missing texvc executable; please see math/README to configure.): G = \frac{1}R = \frac{I}V

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

Failed to parse (Missing texvc executable; please see math/README to configure.): \mbox{S} = \Omega^{-1} = \dfrac{\mbox{A}}{\mbox{V}}

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[link]

Mho is an alternative name of the same unit, the reciprocal of one ohm. Mho is derived from spelling ohm backwards and is written with an upside-down capital Greek letter Omega: Failed to parse (Missing texvc executable; please see math/README to configure.): \mho , Unicode symbol U+2127 (℧). According to Maver^[3] the term mho was suggested by Sir William Thomson. The mho was officially renamed^{[citation needed]} to the siemens, replacing the old meaning of the "siemens unit", at a conference in 1881.^[4]

The term siemens, as it is a SI term, is used universally in science and often in electrical applications, while mho is still used primarily in electronic applications. Two reasons are usually given^{[citation needed]} for using mho instead of siemens in electronic applications:

• The inverted Omega and the mho, 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.
• The term siemens could be confused with the large multinational electronics company Siemens.

References[link]

1. ^ The International System of Units, section 5.2.
2. ^ NIST Guide to SI Units - 9 Rules and Style Conventions for Spelling Unit Names, National Institute of Standards and Technology
3. ^ Maver, William: American Telegraphy and Encyclopedia of the Telegraph: Systems, Apparatus, Operation. 1903.
4. ^ http://www.tech-faq.com/siemens.html

• Brochure "The International System of Units" issued by the BIPM
• Different units named after Siemens

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Siemens AG

Type	Aktiengesellschaft
Traded as	FWB: SIE, NYSE: SI
Industry	Conglomerate
Founded	October 1, 1847 (1847-10-01) (Berlin)
Founder(s)	Werner von Siemens
Headquarters	Berlin, Munich and Erlangen, Germany, European Union
Area served	Worldwide
Key people	Peter Löscher (President and CEO) Joe Kaeser (CFO) Gerhard Cromme (Chairman of the supervisory board)
Products	Communication systems, power generation technology, industrial and buildings automation, lighting, medical technology, railway vehicles, water treatment systems, home appliances, fire alarms, PLM software
Services	Business services, financing, project engineering and construction
Revenue	€73.52 billion (2010/2011)[1]
Operating income	€7.958 billion (2010/2011)[1]
Net income	€6.145 billion (2010/2011)[1]
Total assets	€104.24 billion (September 2011)[1]
Total equity	€31.53 billion (September 2011)[1]
Employees	360,000 (September 2011)[1]
Divisions	Industry, Energy, Healthcare, Infrastructure and Cities
Website	www.siemens.com

Operational Siemens AG 170 kW hydropower generator built and installed in 1912 in Tsarska Bistritsa Palace, Bulgaria

Siemens AG (German pronunciation: [ˈziːməns]) is a German multinational conglomerate company headquartered in Munich, Germany. It is the largest Europe-based electronics and electrical engineering company.^[2]

Siemens is an integrated technology company with activities in the fields of industry, energy and healthcare. It is organised into six main divisions: Industry, Energy, Healthcare, Equity Investments, Siemens IT Solutions, and Services and Siemens Financial Services (SFS).

Siemens and its subsidiaries employ approximately 360,000 people across nearly 190 countries and reported global revenue of approx 71 billion euros for the year of 2011.^[3] Siemens AG is listed on the Frankfurt Stock Exchange, and has been listed on the New York Stock Exchange since March 12, 2001.

History[link]

Founder generation[link]

Siemens & Halske was founded by Werner von Siemens on 12 October 1847. Based on the telegraph, his invention used a needle to point to the sequence of letters, instead of using Morse code. The company, then called Telegraphen-Bauanstalt von Siemens & Halske, opened its first workshop on October 12.

In 1848, the company built the first long-distance telegraph line in Europe; 500 km from Berlin to Frankfurt am Main. In 1850 the founder's younger brother, Carl Wilhelm Siemens started to represent the company in London. In the 1850s, the company was involved in building long distance telegraph networks in Russia. In 1855, a company branch headed by another brother, Carl Heinrich von Siemens, opened in St Petersburg, Russia. In 1867, Siemens completed the monumental Indo-European (Calcutta to London) telegraph line.^[4]

In 1881, a Siemens AC Alternator driven by a watermill was used to power the world's first electric street lighting in the town of Godalming, United Kingdom. The company continued to grow and diversified into electric trains and light bulbs. In 1890, the founder retired and left the company to his brother Carl and sons Arnold and Wilhelm.

Turn of the 20th century[link]

Siemens & Halske (S&H) was incorporated in 1897, and then merged parts of its activities with Schuckert & Co., Nuremberg in 1903 to become Siemens-Schuckert.

In 1907 Siemens (Siemens & Halske and Siemens-Schuckert) had 34,324 employees and was the seventh-largest company in the German empire by number of employees.^[5] (see List of German companies by employees in 1907)

In 1919, S&H and two other companies jointly formed the Osram lightbulb company. A Japanese subsidiary was established in 1923.

During the 1920s and 1930s, S&H started to manufacture radios, television sets, and electron microscopes.

In 1932, Reiniger, Gebbert & Schall (Erlangen), Phönix AG (Rudolstadt) and Siemens-Reiniger-Veifa mbH (Berlin) merged to form the Siemens-Reiniger-Werke AG (SRW), the third of the so-called parent companies that merged in 1966 to form the present-day Siemens AG.^[6]

In the 1920s Siemens constructed the Ardnacrusha Hydro Power station on the River Shannon in the then Irish Free State, and it was a world first for its design. The company is remembered for its desire to raise the wages of its under-paid workers only to be overruled by the Cumann na nGaedheal government.^[7]

World War II era and Nazi Germany[link]

A Siemens truck being used as a Nazi public address vehicle in 1932

Preceding World War II, Siemens was involved in funding the rise of the Nazi Party and the secret rearmament of Germany. During the second World War, Siemens supported the Hitler regime, contributed to the war effort and participated in the "Nazification" of the economy. Siemens had many factories in and around notorious concentration camps^[8][9] to build electric switches for military uses.^[10] In one example, almost 100,000 men and women from Auschwitz worked in a Siemens factory inside the camp, supplying the electricity to the camp.

In 1972, a German satirist, F. C. Delius, published "Unsere Siemenswelt" (Our Siemens World), a mock history of Siemens. The book was a fake official company publication, which boasted "accomplishments" such as the installation of the crematoria at Auschwitz. Siemens brought Delius to trial and it was determined much of the book contained false claims. Interestingly, a series of depositions, trials, and appeals brought to light the conduct of Siemens during the Nazi regime. Contemporary scholars have been uncovering some of the atrocities of Siemens during this time, including forced and slave labor at Ravensbrück and in the Auschwitz subcamp of Bobrek, among others. Additionally, the company supplied electrical parts to concentration camps and death camps. The factories had poor working conditions, where malnutrition and death were common. Also, the scholarship has shown that the camp factories were created, run, and supplied by the SS, in conjunction with company officials, sometimes high-level officials. ^[11]

Siemens businessman and Nazi Party member John Rabe is credited with saving many Chinese lives during the Nanking Massacre. He later toured Germany lecturing on the atrocities committed in Nanking.^[12]

Post-war[link]

A 1973 Siemens electron microscope, Musée des Arts et Métiers, Paris

In the 1950s and from their new base in Bavaria, S&H started to manufacture computers, semiconductor devices, washing machines, and pacemakers.

In 1966, Siemens & Halske (S&H, founded in 1847), Siemens-Schuckertwerke (SSW, founded in 1903) and Siemens-Reiniger-Werke (SRW, founded in 1932) merged to form Siemens AG.^[6]

In 1969, Siemens formed Kraftwerk Union with AEG by pooling their nuclear power businesses.^[13]

The company's first digital telephone exchange was produced in 1980. In 1988 Siemens and GEC acquired the UK defence and technology company Plessey. Plessey's holdings were split, and Siemens took over the avionics, radar and traffic control businesses — as Siemens Plessey.

In 1985 Siemens bought Allis-Chalmers' interest in the partnership company Siemens-Allis (formed 1978) which supplied electrical control equipment. It was incorporated into Siemens' Energy and Automation division.^[14]

In 1987, Siemens reintegrated Kraftwerk Union, the unit overseeing nuclear power business.^[13]

In 1991, Siemens acquired Nixdorf Computer AG and renamed it Siemens Nixdorf Informationssysteme AG, in order to produce personal computers.

In October 1991, Siemens acquired the Industrial Systems Division of Texas Instruments, Inc, based in Johnson City, Tennessee. This division was organized as Siemens Industrial Automation, Inc., and was later absorbed by Siemens Energy and Automation, Inc.

In 1997 Siemens agreed to sell the defence arm of Siemens Plessey to British Aerospace (BAe) and a German aerospace company, DaimlerChrysler Aerospace. BAe and DASA acquired the British and German divisions of the operation respectively.^[15]

In October 1997, Siemens Financial Services (SFS) was founded to act as competence center for financing issues and as a manager of financial risks within Siemens.

In 1999, Siemens' semiconductor operations were spun off into a new company known as Infineon Technologies. Also, Siemens Nixdorf Informationssysteme AG formed part of Fujitsu Siemens Computers AG in that year. The retail banking technology group became Wincor Nixdorf.

Siemens Velaro high speed trains in service in Changsha, China.

In 2000 Shared Medical Systems Corporation^[16] was acquired by the Siemens' Medical Engineering Group,^[17] eventually becoming part of Siemens Medical Solutions.

Also in 2000 Atecs-Mannesman was acquired by Siemens,^[18] The sale was finalised in April 2001 with 50% of the shares acquired, acquisition, Mannesmann VDO AG merged into Siemens Automotive forming Siemens VDO Automotive AG, Atecs Mannesmann Dematic Systems merged into Siemens Production and Logistics forming Siemens Dematic AG, Mannesmann Demag Delaval merged into the Power Generation division of Siemens AG.^[19] Other parts of the company were acquired by Robert Bosch GmbH at the same time.^[20]

In 2001 Chemtech Group of Brazil was incorporated into the Siemens Group,^[21] the company provides industrial process optimisation, consultancy and other engineering services^[22]

Also in 2001, Siemens formed joint venture Framatome with Areva SA of France by merging much of their nuclear businesses.^[13]

In 2003 Siemens acquired the flow division of Danfoss and incorporated it into the Automation and Drives division.^[23] Also in 2003 Siemens acquired IndX software (realtime data organisation and presentation).^[24][25] The same year in an unrelated development Siemens reopened its office in Kabul.^[26] Also in 2003 agreed to buy Alstom Industrial Turbines; a manufacturer of small, medium and industrial gas turbines for 1.1 billion Euro.^[27][28]

In 2004 the wind energy company Bonus Energy in Brande, Denmark was acquired,^[29][30] forming Siemens Wind Power division.^[31] Also in 2004 Siemens invested in Dasan Networks (South Korea, broadband network equipment) acquiring ~40% of the shares,^[32] Nokia Siemens disinvested itself of the shares in 2008.^[33] The same year Siemens acquired Photo-Scan (UK, CCTV systems)^[34] US Filter Corporation (water and Waste Water Treatment Technologies/ Solutions, acquired from Veolia),^[35] Hunstville Electronics Corporation (automobile electronics, acquired from Chrysler),^[36] and Chantry Networks (WLAN equipment)^[37]

In 2005 Siemens sold the Siemens mobile manufacturing business to BenQ, forming the BenQ-Siemens division. Also in 2005 Siemens acquired Flender Holding GmbH (Bocholt, Germany, gears/industrial drives),^[38] Bewator AB (building security systems),^[39] Wheelabrator Air Pollution Control, Inc. (Industrial and power station dust control systems),^[40] AN Windenegrie GmbH. (Wind energy),^[41] Power Technologies Inc. (Schenectady, USA, energy industry software and training),^[42] CTI Molecular Imaging (Positron emission tomography and molecular imaging systems),^[43][44] Myrio (IPTV systems),^[45] Shaw Power Technologoes International Ltd (UK/USA, electrical engineering consulting, acquired from Shaw Group),^[46][47] and Transmitton (Ashby de la Zouch UK, rail and other industry control and asset management).^[48]

In 2006, Siemens announced the purchase of Bayer Diagnostics, which was incorporated into the Medical Solutions Diagnostics division on 1 January 2007,^{[citation needed]} also in 2006 Siemens acquired Controlotron (New York) (ultrasonic flow meters)^[49][50] Also in 2006 Siemens acquired Diagnostic Products Corp., Kadon Electro Mechanical Services Ltd. (now TurboCare Canada Ltd.), Kühnle, Kopp, & Kausch AG, Opto Control, and VistaScape Security Systems^[51]

Siemens power generating wind turbine towers

In March 2007 a Siemens board member was temporarily arrested and accused of illegally financing a business-friendly labour association which competes against the union IG Metall. He has been released on bail. Offices of the labour union and of Siemens have been searched. Siemens denies any wrongdoing.^[52] In April the Fixed Networks, Mobile Networks and Carrier Services divisions of Siemens merged with Nokia's Network Business Group in a 50/50 joint venture, creating a fixed and mobile network company called Nokia Siemens Networks. Nokia delayed the merger^[53] due to bribery investigations against Siemens.^[54] In October 2007, a court in Munich found that the company had bribed public officials in Libya, Russia, and Nigeria in return for the awarding of contracts; four former Nigerian Ministers of Communications were among those named as recipients of the payments. The company admitted to having paid the bribes and agreed to pay a fine of 201 million euros. In December 2007, the Nigerian government cancelled a contract with Siemens due to the bribery findings.^[55][56]

Also in 2007 Siemens acquired Vai Ingdesi Automation (Argentina, Industrial Automation), UGS Corp., Dade Behring, Sidelco (Quebec, Canada), S/D Engineers Inc., and Gesellschaft für Systemforschung und Dienstleistungen im Gesundheitswesen mbH (GSD) (Germany).

In July 2008, Siemens AG announced a joint venture of the Enterprise Communications business with the Gores Group. The Gores Group holding a majority interest of 51% stake, with Siemens AG holding a minority interest of 49%.^[57]

In January 2009, Siemens announced to sell its 34% stake in Framatome, complaining limited managerial influence. In March, it announced to form an alliance with Rosatom of Russia to engage in nuclear-power activities.^[13]

In April 2009, Fujitsu Siemens Computers became Fujitsu Technology Solutions as a result of Fujitsu buying out Siemens' share of the company.

In October 2009, Siemens signed a $418-million contract to buy Solel Solar Systems an Israeli company in the solar thermal power business.^[58]

In March 2011, it was decided to list Osram on the stock market in the autumn, but CEO Peter Löscher said Siemens intended to retain a long-term interest in the company, which was already independent from the technological and managerial viewpoints.

In September 2011 Siemens announced that after the Fukushima disaster and the turnaround in German energy policy, the company, responsible for building all 17 of Germany's existing nuclear power plants, would leave the nuclear sector.^[59]

Chief executives and executive board members[link]

This list or list section may be better with years. Please help improve this list or discuss it on the talk page. (August 2010)

Corporate divisions[link]

This article is missing information about Structure between 2009-2011. This concern has been noted on the talk page where whether or not to include such information may be discussed. (May 2012)

Management[link]

Peter Löscher (formerly of Merck) is the current president and the CEO as of July 1, 2007.^[60] He succeeded Dr. Klaus Kleinfeld after the scandal charges of bribery against Siemens. Gerhard Cromme is the current chairman of the supervisory board of Siemens AG. He succeeded Dr. Heinrich von Pierer on April 26, 2007.

Organization structure[link]

As of 1 October 2011, the company is divided into 4 sectors and a total of 19 divisions:

• Industry Sector (led by Siegfried Russwurm)
  • Comprising 3 divisions: Industry Automation, Drive Technologies, Customer Services
• Energy Sector (led by Michael Süß)
  • Comprising 6 divisions: Fossil Power Generation, Wind Power, Solar & Hydro, Oil & Gas, Energy Service, Power Transmission
• Healthcare Sector (led by Hermann Requardt)
  • Comprising 4 divisions: Imaging & Therapy Systems, Clinical Product, Diagnostics, Customer Solutions
• Infrastructure & Cities (led by Roland Busch)
  • Comprising 6 divisions: Rail Systems, Mobility and Logistics, Low and Medium Voltage, Smart Grid, Building Technologies, OSRAM

In addition two other organisations Siemens IT Solutions and Services and Siemens Financial Services were part of the group, providing services to the other divisions.^[61]

Key business areas and subsidiary companies before 2009[link]

This section's factual accuracy is disputed. Please help to ensure that disputed facts are reliably sourced. See the relevant discussion on the talk page.

Siemens' operational business areas before 2009 were:

• Automation & Control (Automation & Drives, Industrial Solutions & Services, Siemens Building Technologies)
• Power,^[62]
• Transportation
  • Rail (see Siemens Transportation Systems)
  • Automotive^[63]
• Medical (Siemens Healthcare)
• Information & Communication (Siemens Communications, Siemens IT Solutions and Services, and until 1 April 2009 50% of Fujitsu Siemens Computers)
• Lighting (OSRAM GmbH, OSRAM Sylvania).

The company also operated subsidiaries for Financing (Siemens Financial Services), Real Estate (Siemens Real Estate), Home Appliances (BSH), Water Technologies (SWT) and Business Services.

Joint ventures[link]

This section requires expansion.

In addition to the Nokia Siemens telecommunications giant formed in 2006 the company has a number of other joint ventures:

• Siemens Traction Equipment Ltd. (STEZ), Zhuzhou China, is a joint venture between Siemens, Zhuzhou CSR Times Electric Co., Ltd. (TEC) and CSR Zhuzhou Electric Locomotive Co., Ltd. (ZELC). which produces AC drive electric locomotives and AC locomotive traction components.^[64]

• Silcar Pty. Ltd., Silcar’s parent companies are Siemens Ltd and Thiess Services Pty Ltd. Silcar has 50/50 shareholders; Siemens Ltd (a global leader in electrical engineering and electronics) and Thiess Services (a leading integrated engineering and services provider in Australasia and South East Asia). Silcar is a 3,000 person Australian organisation providing productivity and reliability for large scale and technically complex plant assets. Services include asset management, design, construction, operations and maintenance. Silcar operates across a range of industries and essential services including power generation, electrical distribution, manufacturing, mining and telecommunications.

Controversies[link]

2007 price fixing fine[link]

In January 2007 Siemens was fined €396 million by the European Commission for price fixing in EU electricity markets through a cartel involving 11 companies, among which ABB, Alstom, Fuji, Hitachi Japan, AE Power Systems, Mitsubishi Electric Corp, Schneider, Areva, Toshiba and VA Tech^[65] According to the Commission, "between 1988 and 2004, the companies rigged bids for procurement contracts, fixed prices, allocated projects to each other, shared markets and exchanged commercially important and confidential information."^[65] Siemens was given the highest fine of €396 million, more than half of the total, for its alleged leadership role in the incident.

Bribery case[link]

Siemens agreed to pay a record $1.34 billion in fines in December 2008^[66] after being investigated for serious bribery. The investigation found questionable payments of roughly €1.3 billion, from 2002 to 2006 that triggered a broad range of inquiries in Germany, the United States and many other countries.^[67]

In May 2007 a German court convicted two former executives of paying about €6 million in bribes from 1999 to 2002 to help Siemens win natural gas turbine supply contracts with Enel, an Italian energy company. The contracts were valued at about €450 million. Siemens was fined €38 million.^[68]

Iran telecoms controversy[link]

Nokia Siemens supplied telecommunications equipment to the Iranian telecom company that included the ability to intercept and monitor telecommunications, a facility known as "lawful intercept". The equipment was believed to have been used in the suppression of the 2009–2010 Iranian election protests, leading to criticism of the company, including by the European Parliament. Nokia-Siemens later divested its call monitoring business, and reduced its activities in Iran. ^{[69][70][71][72][73][74]}

Greek bribes, greek metro and traffic lights controversy[link]

In 2008, it was revealed that Siemens had bribed the two main political parties of Greece for approximately 10 years to be the sole provider of mechanical and electrical equipment of the Greek state. After the apocalypsis the German authorities arrested the Siemens representatives of Greeks, who escaped from Greek authorities. German justice didn't allow the Greek justice to cross-question the representatives. As a result, typically there isn't any evidence against the corrupt politicians, they haven't been arrested and continue to be in the Greek political system. Meanwhile, the Greek state cancelled the planned trades. Since all the parts of mechanical equipment were provided by Siemens, the equipement eventually breaks down, like traffic lights, and the projects are abandoned like the metro expansion.[1][2][3]^[awkward]

See also[link]

Companies portal

• List of Siemens products
• Siemens Foundation sponsor of the Siemens Westinghouse Competition
• Phoebus cartel
• Allis-Chalmers
• BenQ-Siemens
• Simatic S5 PLC
• General Electric, an American industrial conglomerate of similar size and variety of businesses.

References[link]

Further reading[link]

• Weiher, Siegfried von /Herbert Goetzeler (1984). The Siemens Company, Its Historical Role in the Progress of Electrical Engineering 1847–1980, 2nd ed. Berlin and Munich.
• Feldenkirchen, Wilfried (2000). Siemens, From Workshop to Global Player, Munich.
• Feldenkirchen, Wilfried / Eberhard Posner (2005): The Siemens Entrepreneurs, Continuity and Change, 1847–2005, Ten Portraits, Munich.
• Greider, William (1997). One World, Ready or Not. Penguin Press. ISBN 0-7139-9211-5.

External links[link]

Wikimedia Commons has media related to: Siemens

• Official website

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