Electric Calculator
Calculate electrical parameters such as power, current, voltage, and resistance using Ohm's Law and power formulas.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator uses Ohm's Law and Power formulas to compute missing electrical values. Enter exactly two known values (Voltage, Current, Resistance, or Power) to calculate the other two.
- Enter two values in any of the four fields: Voltage (V), Current (I) in Amps, Resistance (R) in Ohms, or Power (P) in Watts.
- Leave the other two fields empty.
- Click the "Calculate" button.
- View the result showing the two missing values, along with the formula used.
Important: All values must be positive numbers. Zero is not allowed for any input that would cause division by zero (e.g., Voltage cannot be zero when calculating Resistance). Use decimal numbers if needed (e.g., 12.5).
Example: Enter Voltage = 12 and Current = 2 → calculates Resistance = 6 Ω and Power = 24 W.
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Frequently Asked Questions
Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance. The formula is V = I * R.
Enter any two known values among voltage, current, resistance, and power. The calculator will compute the other two using Ohm's Law and power formulas.
Yes, power can be calculated using P = V * I, or derived from other combinations like P = V^2 / R or P = I^2 * R.