Ohm's Law Calculator
Solve for voltage, current, resistance or power — enter any two of the four.
Zvinyorwa zvinogadziridzwa paunenge uchinyora.
Nezve iyi kalkulator
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.
Zvimwe zvinobvunzwa zvakanyanya
Chii chinonzi Ohm's law?
Ohm’s law inoti kuti simba rinofamba nechikonzero chinoenda pamwe chete nesimba rinofamba nechikonzero chinoenda: V = I × R. Kana tikazvigadzirisa, I = V / R uye R = V / I.
Maitiro ekuwana simba remagetsi kubva pa Ohm’s law?
Power voltage nguva nguva iri, P = V × I. Kushandisa Ohm’s pamutemo unogonawo kunyora se P = I² × R kana P = V² / R — zvese zvitatu kupawo zvakafanana watts.
Ndezvipi zviviri zviyero zvandinofanira kuisa?
Choose the quantity you're missing in "Solve for", then enter any two of the other three. To find resistance you can supply voltage and current, or power and current.
Ndinogona kushandisa simba sezvakapihwa, kwete voltage kana simba rekunze?
Yekutanga simba nzvimbo inokutendera kuti kubvisa kubva simba pamwe imwe imwe zhinji — semuenzaniso, a 24 W kutakura pa 2 A anodzokera 12 V uye 6 Ω, kushandisa V = P / I uye R = P / I².
Inoshanda sei kodzero yeOhm ye AC circuits?
Ichi chine chekuita neresistant chikamu cheAC circuit. For circuits with capacitors or inductors you replace resistance with impedance, and power picks up a power factor, but a plain resistor obeys V = I × R at every instant.
Nei yangu resistor inopisa - chii simba rakawanda rinoita kuti riparadzwe?
A resistor anoshandura simba remagetsi kuita mhepo pa P = I² × R watts. A 6 Ω resistor kutakura 2 A dissipates 4 × 6 = 24 W, saka inofanira simba rating nyore pamusoro apo. Undersizing the wattage ndechimwe chikonzero chakafanana chokupisa kana kukundikana resistors.
Chii chinobata izvi zvisina-linear zvinhu sediodes kana LEDs?
Ohm’s law inofunga kuti pane kuremekedza kwakaomarara, saka haisi kuremekedza madiodes, LEDs kana transistors ayo anokwira ne voltage. Kuti uwane LED, iwe unofanirwa kuisa mufananidzo weseries resistor kubva ku voltage yemagetsi, uchibvisa LED’s forward voltage.
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/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);Zviratidzo zvemubvunzo ndezvekufungidzira kwechinangwa chekudzidzisa chete, kwete zvemari, zvehutano kana zvemari.