Free · Physics models

Electrical Power and Current

Convert real electrical power to current for DC, single-phase AC or balanced three-phase AC.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

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Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

Current / amps (I) = 6.2500000. The worked example lists its inputs and unit conventions.

I = P/V (DC); P/(V PF) (single phase); P/(√3 VLL PF) or P/(3 VLN PF).

Worked example

Enter these known values and leave the other values blank.

Current type
2
Power in {{power.fullUnit}} (P)
1200 W
Voltage (V)
240 V
Power factor
0.8
Current / amps (I)
6.25 A

Assumptions and limitations

  • AC voltage and current are RMS values and the three-phase load is balanced. Use real input power rather than apparent power. Positive voltage and power factor are required for the finite inverse current branch. This does not size wiring or protective devices.
  • Clear the quantity to solve an inverse; keep known quantities fixed with locks. Some inverses are singular or ambiguous and require further known values.
  • Unit selectors convert the same physical quantity. Rounded reference constants and presets limit physical accuracy even when arithmetic displays more digits.

Common questions

What does this model assume?

AC voltage and current are RMS values and the three-phase load is balanced. Use real input power rather than apparent power. Positive voltage and power factor are required for the finite inverse current branch. This does not size wiring or protective devices.

Can I solve for an input?

Editable calculated fields support the captured inverse relationships. Clear the unknown and supply enough independent known values; an inverse must remain within the declared physical domain.

References

Enforce the reviewed model domain: Voltage must be positive. Power factor must be positive for a finite current.

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