Ohm's Law Advanced Calculator

Calculate Voltage (V), Current (I), Resistance (R) & Power (P) | Enter any 2 values

Enter any TWO values
V = I × R  |  P = V × I

📖 Ohm's Law Advanced Calculator

Ohm's Law is the fundamental relationship between voltage, current, and resistance in electrical circuits: V = I × R. This advanced calculator allows you to enter any two values and instantly get the other two, including power (P = V × I).

📐 Ohm's Law Formulas

Voltage: V = I × R  |  V = P / I  |  V = √(P × R)
Current: I = V / R  |  I = P / V  |  I = √(P / R)
Resistance: R = V / I  |  R = V² / P  |  R = P / I²
Power: P = V × I  |  P = I² × R  |  P = V² / R

📊 Ohm's Law Triangle

FormulaWhen to Use
V = I × RFind voltage when current and resistance are known
I = V / RFind current when voltage and resistance are known
R = V / IFind resistance when voltage and current are known
P = V × IFind power when voltage and current are known
P = I² × RFind power when current and resistance are known
P = V² / RFind power when voltage and resistance are known

📌 Common Electrical Values

DeviceVoltage (V)Current (A)Resistance (Ω)Power (W)
LED (Red)2.00.021500.04
LED (White)3.20.02900.064
100W Bulb2300.43529100
60W Bulb2300.2688260
USB Charger52.02.510
Car Battery121000.121200

❓ Frequently Asked Questions

What is Ohm's Law? ▼
Ohm's Law states that current is directly proportional to voltage and inversely proportional to resistance. Formula: V = I × R.
How do I calculate power using Ohm's Law? ▼
Power can be calculated using P = V × I, P = I² × R, or P = V² / R.
What is the unit of resistance? ▼
Resistance is measured in Ohms (Ω), named after German physicist Georg Simon Ohm.
Why can't I enter all four values? ▼
You only need to enter any two values. Entering all four would create conflicting results.