Calculator
Nwere ike ịtụle voltaji a hapụla n'ime waya na-agba site n'obosara, ugbua nakwa nha onyeisi.
Nhọrọ ndị ahụ ga-akpụzi mgbe ị na-etipụta.
N'ihe banyere calculator a
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.
Ajụjụ ndị a na-ajụkarị
Olee otú a na-ehazi voltaji kwụsịtụ?
Maka otu-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.
Gịnị bụ voltaji na-akwụsị na-ekweta?
A na-emekarị iwu nke thumb bụ ka ịnagide zuru ezu drop n'okpuru 3% maka branch circuits na 5% zuru ezu. N'ebe dị ukwuu conductors (n'ebe dị ukwuu) na-abawanye drop.
Copper mọọbụ aluminum - ọ bụ ihe dị mkpa?
Ee. Aluminum nwere ihe dịka 60% elu resistivity karịa copper, ya mere aluminum na-agba ọsọ nke otu nha na-apụ n'ụzọ dị iche iche karịa voltaji.
Gịnị mere fomulụ ji jiri ogologo abụọ?
Current nwere ike na-agafe n'ime na-ebu na azụ, ya mere a single-phase circuit na-ahụ na-apụ nke abụọ conductors - ya mere ihe kpatara nke 2 × ogologo. Three-phase circuits iji √3 (n'ihe banyere 1.732) na-ebe, na-egosi na geometric nke balanced three-phase ike.
Olee otú m ga-esi belata nkwụsị nke voltaji?
Jiri nnukwu conductor (na-ebido cross-section na-eme ka ọ bụrụ nke abụọ n'ime nkwụsị), na-ewepụ nkwụsị, wepụta ihe n'ime n'ime parallel cables, ma ọ bụ na-ewepụ nkwụsị. Oge ọ bụla ọ dị mkpa ka ịgbanwee n'ihi na nkwụsị bụ n'ụzọ dị iche iche n'ebe ahụ.
Olee uru ike a na-ewepụ n'ime eriri ahụ?
The ike na-agwụ ike bụ na-apụ oge na-adịghị ugbu a, Ploss = Vdrop × I. A 3.5 V drop na 20 A wastes 70 W dị ka okpomọkụ na waya - ike ị na-akwụ ụgwọ maka ma ọ dịghị mgbe eji, nke bụ ihe mere ogologo elu-akụ na-agba ọsọ na-egosipụta thicker, ala-n'ihi na-anwụ cable.
M ga-eji AWG gajéètì na-enweghị mm² mpaghara?
Ee. Họrọ a gauge na advanced AWG ndepụta na ọ overrides mpaghara ala field na nke gauge nke cross-nkebi na mm² (eg 10 AWG ≈ 5.26 mm²), ka i nwere ike ọrụ na gauge usoro North American installers iji.
API — jiri kaadị a site na kóòdù
Kpọọ kalkulata a dịka ebe ngwụcha JSON n'efu - enweghị kii achọrọ. Ziga valiu ebe ahụ n'okpuru dịka paramita ajụjụ mọọbụ JSON. Ihe ọbụla ị na-ewepụ na-eji dìfọ́ọ̀ltụ̀ nke a na-edebe ihuakwụkwọ a na ya; parameter a na-amaghị bụ 400, ọ dịghị sẽọ̀rọ̀. Gụọ ngwe ndị ahụ niile →
Ebemkpofuozi
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);Ihe a na-ahụta bụ n'ihi nlekọta n'ozuzu ya, ọ bụghị nlekọta ego, ọgwụ ma ọ bụ nlekọta ego.