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Siemens (í) Sainmhíniú aonaid
The siemens is an SI derived unit of electric conductance, electric susceptance, and electric admittance. Conductance, susceptance, and admittance are the reciprocals of resistance, reactance, and impedance respectively. Therefore one siemens is redundantly equal to the reciprocal of one ohm (Ω−1) 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, siemens is used both singular and plural. The siemens is represented by the symbol S.
Forbhreathnú
For an element conducting direct current, electrical resistance R and electrical conductance G are defined as G = 1⁄R = 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 [S] = [Ω-1] = [A/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 millisiemens (mS).
MHO (℧)
Another name for the siemens is the mho (℧). As the reciprocal of one ohm, it is the word ohm spelled backwards, at the suggestion of Sir William Thomson (Lord Kelvin) in 1883. Its symbol is an inverted capital letter omega (℧) from the Greek alphabet.
Tagraíonn treoir NIST maidir le húsáid an Chórais Idirnáisiúnta Aonad (IR) don MHO mar ainm speisialta neamh -ghlactha le haghaidh aonad SI agus léiríonn sé gur chóir é a sheachaint go docht. Úsáidtear an téarma Si Siemens go huilíoch san eolaíocht agus go minic in iarratais leictreacha, agus úsáidtear MHO fós i roinnt comhthéacsanna leictreonacha.
Is lú an seans go gcuirfear mearbhall ar shiombail an chaipitil inbhéartaithe (℧), cé nach giorrúchán oifigiúil IR é, le hathróg ná an litir s agus é ag scríobh ar chlár dubh nó ag déanamh ríomhaireachtaí ailgéabracha de láimh. Is deacair na gnáth -idirdhealú clóghrafaíochta (mar shampla iodálach le haghaidh athróg agus Rómhánach le haghaidh aonad) a choinneáil. Ar an gcaoi chéanna, tá sé deacair idirdhealú a dhéanamh idir an tsiombail S (Siemens) agus an cás íochtarach (soicind), a d'fhéadfadh a bheith ina chúis le mearbhall. Mar sin, mar shampla, d’fhéadfadh sé go mbeadh tras -iompar pentode de 2.2 ms scríofa mar 2.2 m℧ nó 2200 μ℧ (is coitianta sna 1930í) nó 2.2 Ma/V. Is féidir mí-úsáid a bhaint as lámhscríofa freisin mar athróg spáis minicíochta, a úsáidtear go coitianta i bhfeidhmeanna aistrithe. Tháinig an OHM in ionad an sean -aonad Siemens, aonad friotaíochta, ag comhdháil idirnáisiúnta i 1881.
Sainmhínithe Aonad Siomána Leictreach Eile Eile Sainmhínithe
- Attomho (A℧)
- Attosiemens (AS)
- Centimho (C℧)
- Centisiemens (CS)
- Decamho (da℧)
- Decasiemens (DAS)
- Decimho (d℧)
- Decisiemens (DS)
- Dekamho (da℧)
- Dekasiemens (daS)
- Scrúdú (e℧)
- Exasiemens (ES)
- Femtomho (f℧)
- Femtosiemens (FS)
- Gigamho (G℧)
- Gigasiemens (GS)
- Hectomho (H℧)
- Hectosiemens (HS)
- Kilomho (K℧)
- Kilosiemens (KS)
- Megamho (m℧)
- Megasiemens (MS)
- MHO (℧)
- Micromho (μ℧)
- Microsiemens (μS)
- Millimho (m℧)
- Millisiemens (MS)
- Nanomho (n℧)
- Nanosiemens (NS)
- Petamho (P℧)
- Petasiemens (PS)
- Picomho (P℧)
- Picosiemens (PS)
- Quectomho (q℧)
- Quectosiemens (qS)
- Quettamho (Q℧)
- Quettasiemens (QS)
- Ronnamho (R℧)
- Ronnasiemens (RS)
- Rontomho (r℧)
- Rontosiemens (rS)
- Siemens (í)
- Teraramo (t℧)
- Terasiemens (TS)
- Yoctomho (y℧)
- Yoctosiemens (YS)
- Yottamho (y℧)
- Yottasiemens (YS)
- Zeptomho (Z℧)
- Zeptosiemens (ZS)
- Zettamho (Z℧)
- Zettasiemens (ZS)
Tiontaigh go haonad seoltachta leictrigh eile
Sainmhínithe gaolmhara
Séanadh
Cé go bhfuil gach iarracht déanta chun an tiontaire aonaid seo a thástáil, ní féidir linn a bheith faoi dhliteanas i leith aon damáistí speisialta, teagmhasacha, indíreacha nó iarmhartacha nó caillteanais airgeadaíochta de chineál ar bith a eascraíonn as nó i dtaca le húsáid aon cheann de na huirlisí tiontaire agus faisnéis a fuarthas ón láithreán gréasáin seo. Cuirtear an tiontaire aonaid seo ar fáil mar sheirbhís duit, bain úsáid as do riosca féin le do thoil. Ná bain úsáid as ríomhanna le haghaidh aon rud ina bhféadfadh cailliúint saoil, airgead, maoin, srl.
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Foinsíocht
“Siemens (Unit).” Wikipedia, Wikimedia Foundation, 14 Sept. 2020, en.wikipedia.org/wiki/Siemens_(unit).