Ohm’s law calculator
Calculate current and power in a resistive circuit.
01
Your measurements
Enter your project values. Your estimate updates as you type.
View your estimateExample values are a starting point. Check product yields and specifications before ordering.
YOUR ESTIMATE
Current
2A
Power24 W
Calculated from your measurements.
How it's calculated
Current = voltage ÷ resistance. Power = voltage² ÷ resistance.
Calculations use consistent units for your selected measurements. Whole purchase quantities are rounded up.
What this estimate includes
Assumes a constant resistance and voltage. Installation design and protective devices require separate assessment.
Quantity and arithmetic estimates only. Use project specifications for installation and design requirements.
IN THIS TRADE