Voltage Drop Calculator
Kufungidzira voltage yarasikirwa pamwe chete waya kutamba kubva urefu, zvino uye conductor saizi.
Zvinyorwa zvinogadziridzwa paunenge uchinyora.
Nezve iyi kalkulator
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.
Zvimwe zvinobvunzwa zvakanyanya
Sei voltage kudonha inofungidzirwa?
Kune imwe-phase, Vdrop = 2 × ρ × L × I / A. The factor 2 accounts for the current traveling out and back; three-phase uses √3 instead of 2.
Chii voltage kudonha kunogona kubvumirwa?
A common rule of thumb ndechokuti ugare ne total drop pasi pe 3% ye branch circuits uye 5% overall.Larger conductors (bigger area) reduce the drop.
Copper kana aluminium - chii chinokosha?
Aluminium ine pamusoro 60% yepamusoro resistivity kupfuura kodhi, saka aluminium run of iyo imwechete saizi inotadza proportionally zvakawanda voltage.
Nei formula inoshandisa kaviri kureba?
Current anofanira kubuda kutakura uye kudzoka, saka imwe-phase circuit anoona kudonha kwevaviri conductors - saka chikonzero 2 × urefu. Three-phase circuits kushandisa √3 (anenge 1.732) panzvimbo, kuratidzwa geometry of balanced three-phase simba.
Ndiani anofanira kubvisa voltage?
Usashandisa mukuru conductor (kudzokorora cross-section zvakapetwa kaviri pamusoro kupera kudonha), kuderedza kutamba, kuparadza kutakura pamusoro parallel cables, kana kukwira voltage. Bigger copper ndeimwe yezvikonzero zvakajairika kubvisa sezvo kudonha iri inversely proportional kune nzvimbo.
Ndezvipi simba rakawanda rakarasikirwa mu cable?
The simba rakanga rarwadziwa ndechimwe nguva kudonha kwezvino, Ploss = Vdrop × I. A 3.5 V kudonha pa 20 A mvura 70 W semhepo mu waya - simba unobhadhara asi kamwe chete kushandisa, izvo ndezvipi zvachose nguva refu high-zvinofamba zvinopa chokwadi chikuru, pasi-kuora waya.
Ndinogona kushandisa AWG gauges sezvandinoda, asi ndisingafanirwe kushandisa mm²?
Yeah. Pick a gauge mu advanced AWG bhokisi uye inoshandura nzvimbo field ne cross-section yeiyo gauge mu mm² (eg 10 AWG ≈ 5.26 mm²), saka unogona kushanda mu gauge system North American vagadziri kushandisa.
API — kushandisa iyi kalkulator kubva code
Nhare iyi calculator semahara JSON endpoint - hapana chikuru zvinodiwa. Kutumira nzvimbo mavara pasi separameter query kana JSON. Chii zvachose chaunoisa kunze chinoshandisa default iyo peji iri rakasviba nayo; parameter isiri yechokwadi inonzi 400, uye haisi zero. Tora yakazara API docs →
Endpoint
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);Zviratidzo zvemubvunzo ndezvekufungidzira kwechinangwa chekudzidzisa chete, kwete zvemari, zvehutano kana zvemari.