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How This Calculator Works
Ohm’s Law describes the fundamental relationship between voltage, current, and resistance
in any electrical circuit: voltage equals current multiplied by resistance. Enter any two of
the three, and this calculator finds the third, along with the power the circuit is using.
This is the general-purpose electrical relationship, distinct from the
Voltage Drop Calculator, which answers a more specific question — how much voltage is lost
over a run of wire, given its gauge, length, and material.
The Formula
Voltage:V=I×R
Current:I=V÷R
Resistance:R=V÷I
Power (always computed):P=V×I
Like the Circle Calculator, none of these three variables has a single fixed “input” role
— whichever two you know solve for the third — so they’re left uncolored rather than assigning
one a fixed color it wouldn’t consistently play across every direction.
Worked Example
A circuit with 2 amps of current flowing through a 6 ohm resistor:
Voltage: 2×6=12 V.
Power: 12×2=24 W.
All three solve-for modes agree: entering 12V and 6Ω finds 2A; entering 12V and 2A finds 6Ω —
each direction gives the same consistent circuit.
Cómo funciona esta calculadora
La Ley de Ohm describe la relación fundamental entre voltaje, corriente y resistencia en
cualquier circuito eléctrico: el voltaje es igual a la corriente multiplicada por la
resistencia. Ingresa dos cualesquiera de los tres valores, y esta calculadora encuentra el
tercero, junto con la potencia que está usando el circuito.
Esta es la relación eléctrica de propósito general, distinta de la
Voltage Drop Calculator, que responde una pregunta más específica — cuánto voltaje se pierde
a lo largo de un tramo de cable, dado su calibre, longitud y material.
La fórmula
Voltaje:V=I×R
Corriente:I=V÷R
Resistencia:R=V÷I
Potencia (siempre calculada):P=V×I
Al igual que en la Circle Calculator, ninguna de estas tres variables tiene un único rol
fijo de “entrada” — las dos que conozcas resuelven la tercera — así que se dejan sin colorear en
lugar de asignarle a una un color fijo que no jugaría de forma consistente en cada dirección.
Ejemplo resuelto
Un circuito con 2 amperios de corriente fluyendo a través de una resistencia de 6 ohmios:
Voltaje: 2×6=12 V.
Potencia: 12×2=24 W.
Los tres modos de resolución concuerdan: ingresar 12V y 6Ω encuentra 2A; ingresar 12V y 2A
encuentra 6Ω — cada dirección da el mismo circuito consistente.
Ohm's Law states that voltage equals current multiplied by resistance (V = I × R) in an electrical circuit — one of the most fundamental relationships in electronics, describing how these three quantities always relate to each other.
How is power related to voltage, current, and resistance?
Power (in watts) equals voltage multiplied by current: P = V × I. Combined with Ohm's Law, power can also be expressed as I²R or V²/R — this calculator always shows the P = V × I form once all three of voltage, current, and resistance are known.
How is this different from the Voltage Drop Calculator?
Ohm's Law is the general relationship between voltage, current, and resistance in any circuit. Voltage Drop Calculator answers a more specific, practical question — how much voltage is lost over a real run of wire, given its gauge, length, and material — which involves additional factors Ohm's Law alone doesn't capture.
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