I = P / VNo power factor needed for DC circuits.
Electrical Formula Tool
Watts Volts Amps Calculator
Solve for watts, volts, or amps using the relationship between power, voltage, current, and power factor.
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Power factor varies by load. Use the equipment value when available.
Calculated result1000 W · 120 V · DC
8.333 A
Formula used
I = P / VCustom voltage is always supported.
Formulas Used
I = P / (V × PF)Single-phase AC — multiply voltage by power factor.
I = P / (√3 × V × PF)Three-phase AC — divide by √3 ≈ 1.732.
The basic relationship is P = V x I. For AC, real power also depends on power factor. Three-phase systems use the square root of 3.
The basic relationship is P = V x I. For AC, real power also depends on power factor. Three-phase systems use the square root of 3.
Watts, volts, and amps examples
Watts, volts, and amps examples. Use the displayed calculator for a numerical result and check the equipment voltage and power factor before applying it.
Frequently Asked Questions
Which formula should I use?
The basic relationship is P = V x I. For AC, real power also depends on power factor. Three-phase systems use the square root of 3.
Can I use this result for equipment sizing?
Use the result as an estimate and verify equipment specifications, code requirements, and manufacturer data before sizing electrical equipment.