Áireamhán Titim Voltage
Meastachán ar an voltas a cailleadh ar feadh sreang a reáchtáil ó fad, sruth agus méid seoltóir.
Torthaí a nuashonrú mar a chlóscríobh tú.
Maidir leis an áireamhán seo
Every conductor has some resistance, so a little voltage is always lost pushing current along a cable — that loss is the voltage drop. For a single-phase run the drop is Vdrop = 2 × ρ × L × I / A, where the factor 2 accounts for the current travelling out to the load and back along the return conductor; a three-phase run uses √3 instead of 2. Here ρ is the resistivity of the metal (copper ≈ 0.0175 Ω·mm²/m, aluminium ≈ 0.0282 Ω·mm²/m), L is the one-way length in metres, I the load current in amps and A the conductor cross-section in mm². This calculator also reports the resulting percentage drop, the voltage actually delivered at the load and the power wasted as heat in the cable (Ploss = Vdrop × I).
As a worked example, take 20 A flowing 50 m one-way through a 10 mm² copper cable on a 230 V single-phase supply: Vdrop = 2 × 0.0175 × 50 × 20 / 10 = 3.5 V, about 1.5%, so the load sees roughly 226.5 V and the cable wastes 3.5 × 20 = 70 W. Switch the conductor to aluminium and the same run drops about 5.6 V, because aluminium’s resistivity is around 60% higher. You can either type a custom cross-section or pick a standard AWG gauge from the advanced list, which overrides the area field with the gauge’s real mm² value.
Voltage drop matters because motors, lights and electronics misbehave when they are starved of voltage — dim lamps, sluggish motors and nuisance tripping all trace back to oversized drops on long runs. Electricians size cables so total drop stays within about 3% for branch circuits and 5% end-to-end; the result here flags whether your run meets the limit you set, and the fix for a failing run is a larger conductor, a shorter route or, occasionally, a higher supply voltage.
Ceisteanna Coitianta
Conas a ríomhtar titim voltais?
I gcás aon chéim amháin, Vdrop = 2 × ρ × L × I / A. Cuireann an fachtóir 2 cuntas ar an taisteal reatha amach agus ar ais; Úsáideann trí chéim √3 in ionad 2.
Cén titim voltais atá inghlactha?
Is riail coitianta ordóg a choinneáil titim iomlán faoi bhun 3% do chiorcaid brainse agus 5% ar fad.Seoltóirí níos mó (limistéar níos mó) laghdú ar an titim.
Copar nó alúmanam – an bhfuil sé tábhachtach?
Tá friotaíocht thart ar 60% níos airde ag alúmanam ná copar, mar sin titeann voltas níos mó i gcomhréir le rith alúmanaim den mhéid céanna.
Cén fáth a n-úsáideann an fhoirmle dhá uair an fad?
Tá an sruth a bheith ag sileadh amach go dtí an t-ualach agus ar ais, mar sin feiceann ciorcad aon-chéim an titim an dá seoltóirí - dá bhrí sin, an fachtóir 2 × fad. Úsáideann ciorcaid trí phas √3 (thart ar 1.732) ina ionad, ag léiriú an geoiméadracht na cumhachta cothrom trí phas.
Conas a laghdaím titim voltais iomarcach?
Bain úsáid as seoltóir níos mó (doubling an trasghearradh thart ar halfs an titim), giorrú an rith, scoilt an t-ualach thar cáblaí comhthreomhar, nó a ardú ar an voltas soláthair.Is copar níos mó an socrú is gnách toisc go bhfuil titim comhréireach inbhéartaithe le limistéar.
Cé mhéad cumhachta a chailltear sa chábla?
Is é an chumhacht amú an titim amanna an láthair, Ploss = Vdrop × I. A titim 3.5 V ag 20 A dramhaíola 70 W mar teas sa sreang - fuinneamh a íocann tú le haghaidh ach ní úsáid, agus sin an fáth go bhfuil rith fada ard-reatha údar maith tiubha, cábla níos ísle-caillteanas.
An féidir liom tomhasairí AWG a úsáid in ionad limistéar mm²?
Roghnaigh tomhas sa liosta AWG chun cinn agus overrides sé an réimse limistéar leis an tomhas trasghearradh i mm² (m.sh. 10 AWG ≈ 5.26 mm²), ionas gur féidir leat a bheith ag obair sa chóras tomhais úsáid suiteálaithe Mheiriceá Thuaidh.
API — úsáid an áireamhán seo ó chód
Glaoigh ar an áireamhán seo mar chríochphointe JSON saor in aisce - níl aon eochair ag teastáil. Seol na luachanna réimse thíos mar pharaiméadair cheist nó JSON. Anything you omit uses the same default this page is pre-filled with; an unknown parameter is a 400, never a silent zero. Léigh an doiciméadú iomlán API →
Deireadhphointe
GET https://calculator.free/api/v1/voltage-drop/curl
curl "https://calculator.free/api/v1/voltage-drop/?material=copper&length=50¤t=20&area=10&source=230"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/voltage-drop/?" + new URLSearchParams({
"material": "copper",
"length": "50",
"current": "20",
"area": "10",
"source": "230"
}));
const data = await r.json();
console.log(data.results);Is meastacháin iad na torthaí le haghaidh treoir ghinearálta amháin, ní comhairle airgeadais, leighis nó cánach.