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Electrical

Electrical Power Calculator

Electrical power in a DC or purely resistive circuit can be calculated from voltage and current, current and resistance, or voltage and resistance. This calculator provides all three formulations. It does not include three-phase power, power factor, or motor sizing.

TypeInteractive calculator — separate from unit conversions

Calculator

Result
Power48 W

Formulas

Power from V and I
P = V × I
Power from I and R
P = I² × R
Power from V and R
P = V² / R

Diagram

Electrical Power: P = V × IPVIRP = V×IP = I²RP = V²/R

Worked example

A DC load operates at 24 V and draws 2 A. What is the power consumption?

  1. 01P = V × I
  2. 02P = 24 × 2
  3. 03P = 48 W
Result

The DC load consumes 48 W.

FAQ

Does this calculator handle three-phase power?
No. Three-phase power calculations require line/phase distinctions and power factor. This calculator covers DC/resistive single-load power only.
Is this a motor sizing calculator?
No. Motor sizing requires efficiency, service factor, and load profile data, which are outside the scope of this calculator.
Does this include power factor?
No. Power factor applies to AC circuits with reactive loads. This calculator assumes a purely resistive (unity power factor) basis.
Can I calculate energy consumption with this?
This calculator gives instantaneous power (W). To get energy, multiply power by time (e.g., kWh = kW × hours). Energy calculation is not built in.