Ohm's Law Calculator
Enter any two of voltage, current, and resistance to solve the third and the power.
200
Voltage (V)
2
Current (A)
100
Resistance (Ω)
400
Power (W)
Ohm's law relates voltage, current, and resistance. Pick which value to solve for and enter the other two.
How to use
- Choose the value you want to solve for.
- Enter the two known values.
- Read the calculated value and the power in watts.
Frequently asked questions
- What is Ohm's law?
- It states that voltage equals current times resistance (V = I × R).
- How is power calculated?
- Power equals voltage times current (P = V × I).