What Is the Electric Power Calculator?
Electric power (P) is the rate of energy transfer in an electrical circuit, measured in watts (W).
How Does the Electric Power Calculator Work?
P = V × I. Using Ohm's law (V = IR), substitute to get P = I²R or P = V²/R.
Electric Power Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
The three equivalent forms of Ohm's power law, derived from Ohm's Law V = IR.
How to Use the Electric Power Calculator
- Select the two values you know (V & I, I & R, or V & R) and get power.
Step-by-Step Example Calculation
120 V at 5 A
Input Values:
mode:vi
voltage:120
current:5
Worked Steps: P = 120 × 5 = 600 W = 0.6 kW ≈ 0.805 hp.
Understanding Your Result
1 kW = 1000 W. 1 kWh = energy used by 1 kW device in 1 hour.
Factors That Affect the Result
- AC vs DC: for AC, use RMS voltage and current for average power.
When Should You Use This Calculator?
- Electrical engineering, appliance selection, circuit design, energy billing.
Assumptions & Limitations
- DC or RMS AC values assumed. Resistive loads only for P = I²R / V²/R.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Standard arithmetic; no AC phase angle correction.