Kalkulatè Lwa Ohm
Solve pou vòltaj, koule, rezistans oswa pouvwa — antre nenpòt de nan kat la.
Rezilta yo mete ajou pandan w ap ekri.
Atik sa a
Ohm's law is the single most-used relationship in electronics: the voltage across a resistor equals the current through it times its resistance, V = I × R. Rearranged, the current is I = V / R and the resistance is R = V / I. Power — the rate at which the component turns electrical energy into heat or work — adds a second relationship, P = V × I, which combines with Ohm's law to give the two equivalents P = I² × R and P = V² / R. Together these four quantities form the V–I–R–P 'Ohm's law wheel', and knowing any two of them fixes the other two.
This calculator lets you pick which quantity to solve for and enter any two of the others, then returns the full wheel plus the three equivalent power formulas side by side. For example, a 12 V supply driving a 6 Ω resistor gives I = 12 / 6 = 2 A and P = 12 × 2 = 24 W; check it with P = I² × R = 4 × 6 = 24 W and P = V² / R = 144 / 6 = 24 W, all agreeing. Because the tool back-fills every missing value, entering power and current instead is just as valid — 24 W at 2 A returns 12 V and 6 Ω.
Ohm's law holds exactly for any DC resistive circuit and for the resistive part of an AC circuit, which makes it the everyday tool for sizing current-limiting resistors, choosing LED droppers, working out fuse and wire ratings, reading how much a heater or motor will draw, and predicting the heat a resistor must dissipate. It does not by itself describe capacitors, inductors or non-ohmic parts like diodes, where the voltage–current relationship is no longer a straight line.
Kesyon ki poze souvan
Ki sa ki se lwa Ohm?
Lwa Ohm di ke koule a nan yon kondui se pwopòsyonèl ak vòltaj la sou li: V = I × R. Rearranged, I = V / R ak R = V / I.
Ki jan pou m jwenn pouvwa elektrik soti nan lwa Ohm?
Power se tan tan vòltaj la, P = V × I. Avèk lwa Ohm ou ka tou ekri li kòm P = I² × R oswa P = V² / R — tout twa bay menm wats.
Ki de valè mwen dwe antre?
Chwazi kantite lajan ou pa jwenn nan "Solution for", epi antre nenpòt de nan twa lòt yo. Pou jwenn rezistans ou ka bay vòltaj ak kouryèll, oswa pouvwa ak kouryèll.
Èske mwen ka itilize pouvwan plas de vòltaj la oswa koule a kòm yon enpòte?
Fòmasyon pouvwa avanse a pèmèt ou rezoud soti nan pouvwa plis yon lòt kantite lajan — pou egzanp, yon 24 W chaj nan 2 A retounen 12 V ak 6 Ω, ki itilize V = P / I ak R = P / I².
Èske lwa Ohm a travay pou AC circuits?
Li aplike dirèkteman nan pati rezistan nan yon sikwi AC. Pou sikwi ak kapasitè oswa inductors ou ranplase rezistans ak impedance, ak pouvwa a pran yon faktè pouvwa, men yon rezistan senp obeyi V = I × R nan chak instant.
Poukisa rezistè m'retounen cho - konbyen pouvwa li dissipe?
Yon rezistan vire enèji elektrik nan chalè nan P = I² × R watts. Yon 6 Ω rezistan ki pote 2 A dissipes 4 × 6 = 24 W, se konsa li bezwen yon rating pouvwa a konforab pi wo a sa a. Undersizing Wattage se ka a ki pi komen nan resistors boule oswa fail.
Èske sa a ka sèvi ak pati non-linèt tankou diode oswa LEDs?
Ohm’s Law assumes a constant resistance, so it does not model diodes, LEDs or transistors whose current rises non-linearly with voltage. Pou yon LED ou an plas sa a gwosè yon seri rezistè soti nan vòltaj la sous mwens LED devan vòltaj.
API — itilize sa a calculateur soti nan kòd
Apèl sa a calculateur kòm yon gratis JSON pwent-de-fini - pa gen okenn kle ki nesesè. Envoye valè jaden anba a kòm paramèt kesyonè oswa JSON. Anything you omit uses the same default this page is pre-filled with; an unknown parameter is a 400, never a silent zero. Li dokiman API a an antye →
Endpoint
GET https://calculator.free/api/v1/ohms-law/curl
curl "https://calculator.free/api/v1/ohms-law/?solve=r&voltage=12¤t=2&resistance=6"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/ohms-law/?" + new URLSearchParams({
"solve": "r",
"voltage": "12",
"current": "2",
"resistance": "6"
}));
const data = await r.json();
console.log(data.results);Rezilta yo se estimasyon pou kòmandman jeneral sèlman, pa finansye, medikal oswa konsèy taks.