I-Calculator ye-Ohm's Law
Iingxaki zombane, umsinga, uxinzelelo okanye amandla - faka naziphi na ezimbini zesine.
Iinketho ze projekti
Malunga nale Calculator
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.
Imibuzo ebuza rhoqo
Yintoni umthetho kaOhm?
Umthetho ka-Ohm uchaza ukuba umsinga odlulayo kumqhubi ulingana noxinzelelo oludlulayo kulo: V = I × R. Uphinde ucwangciswe, I = V / R noR = V / I.
Ndiyifumana njani amandla egesi esuka kumthetho kaOhm?
Umandla unamandla ombane amaxesha exesha elikhoyo, P = V × I. Ukusebenzisa umthetho ka-Ohm ungabhala njenge P = I² × R okanye P = V² / R — zonke ezintathu zinika i-watts efanayo.
Ziziphi iixabiso ezimbini endiza kuzingenisa?
Khetha ubungakanani obulahlekileyo kwi "Solution for", emva koko ngenisa naziphi na ezimbini zezinye ezintathu. Ukufumana uxinzelelo unganika umbane kunye no Current, okanye amandla kunye no Current.
Ndingasebenzisa amandla endaweni ye-voltage okanye i-current njengengeniso?
Ewe. Icandelo eliphambili lomandla likuvumela ukuba uphumeze ukusuka kumandla ongezelelweyo omnye ubukhulu - umzekelo, umthwalo we-24 W kwi-2 A ubuyisela 12 V kunye ne-6 Ω, usebenzisa i-V = P / I kunye ne-R = P / I².
Ingaba umthetho kaOhm usebenza kwi-AC circuits?
Isebenza ngqo kwinxalenye emelanayo ye-AC circuit. Kwi circuits ezine-condensers okanye ii-inducers utshintshe ukulwa nokungazinzi, kwaye amandla athatha i-power factor, kodwa umgcini-mandla oqhelekileyo ulandela iV = I × R kwixesha ngalinye.
Kutheni i-resistor yam ishushu—ikhupha amandla angaphi?
Umgcini-mandla uguqula amandla e-elektroniki ukuba yi-oyile kwi-P = I² × R watts. Umgcini-mandla we-6 Ω ophethe i-2 A ususa 4 × 6 = 24 W, ngoko ke kufuneka uluhlu lomandla olukhululekileyo ngaphezulu kwayo. Ukunyuka ngaphantsi kwe-watts kubangela oqhelekileyo wokutywina okanye ukulahleka komgcini-mandla.
Ingaba le iphatha iinxalenye ezingalunganga ezifana neediodes okanye iiLEDs?
Akukho nto. Umthetho ka-Ohm ukholelwa ukuba kukho uxinzelelo oluqhubekayo, ngoko ke awunakuvelisa ii-diodes, ii-LEDs okanye ii-transistors ezinyukayo ngokuthe ngqo ngaphandle koxinzelelo. Kwi-LED ukhetha ubungakanani boluhlu loxinzelelo oluvela kunikezelo loxinzelelo olungaphantsi koxinzelelo oluphambili lwe-LED.
API — sebenzisa le calculator ukusuka kwikhowudi
Nceda le khadi lemali njengendawo esemva ye-JSON ekhululekileyo - akukho qhosha lifunekayo. Thumela amaxabiso endawo ezantsi njengeparameter yombuzo okanye i-JSON. Nantoni na oyenzayo isebenzisa okungagqibekanga okufanayo eli phepha ligqityiwe ngaphambili; iparameter engaziwayo yi 400, ayikho i zero ekhululekileyo. Funda i-API epheleleyo →
Incopho yesiphelo
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);Results are estimates for general guidance only, not financial, medical or tax advice.