Ohm's Law Calculator
Enter any two values to instantly calculate the other two parameters using Ohm's Law.
Ohm's Law Calculator
Calculate Voltage, Current, Resistance, and Power
Calculated Results
- Voltage: V = I × R
- Current: I = V / R
- Resistance: R = V / I
- Power: P = V × I = I² × R = V² / R
How to use Ohm's Law Calculator
- Select the two values you already know.
- Enter the numeric values into the corresponding input fields.
- Read the automatically calculated results for the other two values instantly.
What is Ohm's Law Calculator?
Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points. The mathematical formula is V = I × R (Voltage = Current × Resistance). By extension, Power (P) in watts is calculated as P = V × I.
This calculator is handy for electronics engineers, hobbyists, students, and electricians working with circuits and electrical wiring.
FAQ
- What is Ohm's Law?
- Ohm's Law is a fundamental principle of electronics showing the relationship between Voltage (V), Current (I), and Resistance (R): V = I * R.
- What are the units of measurement?
- Voltage is measured in Volts (V), Current in Amperes or Amps (A), Resistance in Ohms (Ω), and Power in Watts (W).
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