Ohm's Law Calculator
Solve voltage, current, or resistance and calculate circuit power.
Voltage
12 V
Current
2 A
Resistance
6 ohms
Power
24 W
Formula
V = I x R. P = V x I.
Solve voltage, current, or resistance and calculate circuit power.
How to Use
Solve voltage, current, or resistance and calculate circuit power. Enter the Solve for, Voltage, Current, and Resistance values and review the Voltage, Current, Resistance, and Power outputs after you calculate.
- Open the calculator : Start with Ohm's Law Calculator.
- Enter values : Fill in the required inputs and any optional settings.
- Review the result : Read the output and use the about page for more detail if needed.
Common Questions
What formula does the Ohm's Law Calculator use?
V = I x R. P = V x I.
What is Ohm's Law?
Ohm's Law is a fundamental rule in electronics stating that current (I) is equal to voltage (V) divided by resistance (R). The standard formula is mathematically expressed as V = I × R.
How do you calculate wattage using Ohm's Law?
While technically part of Joule's Law, power (Watts) is commonly calculated alongside Ohm's law. To find wattage, multiply the Voltage by the Current (Amps). The formula is P = V × I.