🎓 Physics • Electricity
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Ohm’s Law Calculator (V = IR)
Interactive Ohm's Law solver. Input any 2 values to compute Voltage (V), Current (I), Resistance (R), and Power (P).
Fundamental Circuit Law
Ohm\'s Law Calculator
Enter any 2 known values to solve the remaining 2 variables ($V = IR$, $P = VI$).
Voltage (V)
120 V
Electric PotentialCurrent (I)
10 A
Charge Flow RateResistance (R)
12 Ω
ImpedancePower (P)
1200 W
1.20 kW DissipationOhm\'s Wheel Relations & Solved Paths
Voltage Formulas:
V = I · R = P / I = √(P · R)
Current Formulas:
I = V / R = P / V = √(P / R)
Resistance Formulas:
R = V / I = V² / P = P / I²
Power Formulas:
P = V · I = I² · R = V² / R
Solved Variables: Resistance, Power
What is Ohm’s Law?
Ohm’s Law states that the current through a conductor between two points is directly proportional to voltage and inversely proportional to resistance.
Formula & Step-by-Step Calculation
V = I × R, P = V × I = I²R = V² / R
Ohm’s Law and Joule’s First Law equations.
Worked Step-by-Step Examples
Example 1
12V circuit with 2A current
Solution: R = 6 Ω, Power = 24 Watts
• R = 12 / 2 = 6 Ω, P = 12 × 2 = 24 W
Common Real-World & Academic Use Cases
- ✓ Circuit design and breadboarding
- ✓ LED resistor sizing
- ✓ Home appliance electrical wattage checks
How to Use the Ohm’s Law Calculator (V = IR)
1
Input 2 Values
Fill any 2 boxes (V, I, R, or P).
2
Auto-Solve
Inspect the remaining 2 variables.
Frequently Asked Questions
Q: What is an Ohm?
The SI unit of electrical resistance: 1 Volt per Ampere.