Quadratic Equation Solver (ax² + bx + c = 0)
About Power Calculator
The Comprehensive Electrical & Thermodynamic Power ($P$) Calculator computes electrical DC power ($P = VI = I^2 R = V^2/R$), AC single-phase/three-phase real, reactive, and apparent power ($S = VI, P = VI\cos\theta, Q = VI\sin\theta$), horsepower (hp), and thermal BTU/hr heat rates.
How to Use Power Calculator
Step 1
Select Circuit Type (DC, Single-Phase AC, or Three-Phase AC).
Step 2
Enter Voltage, Current, and Power Factor (or Resistance).
Step 3
Review computed real wattage, apparent kVA, and horsepower equivalents.
Step 4
Click "Copy Power Value".
Practical Use Cases for Power Calculator
AC Electric Motor Sizing & Power Factor Correction
Calculate real working power (kW), apparent power (kVA), and capacitor kVAR reactive compensation for industrial 3-phase motors.
PC Power Supply (PSU) & Solar Inverter Load Sizing
Compute total DC wattage draw and thermal heat dissipation for computer components and residential solar inverter arrays.
Input & Output Examples
Calculating AC Power (240V, 15A, PF = 0.85)
Voltage: `240 V`, Current: `15 A`, Power Factor (cos φ): `0.85`
Real Power: `3,060 W (3.06 kW)` | Apparent Power: `3,600 VA (3.6 kVA)` | Reactive Power: `1,895 VAR` | Horsepower: `4.10 hp`
Key Features & Performance
- ✓Modes: DC Circuits, Single-Phase AC Circuits, Three-Phase AC Circuits (Line-to-Line / Line-to-Neutral).
- ✓Calculates: Real Power (Watts), Apparent Power (Volt-Amperes), Reactive Power (VAR), Power Factor ($\cos\phi$).
- ✓Converts output units across: Watts (W), Kilowatts (kW), Megawatts (MW), Horsepower (hp), BTU/hr, and Joules/sec.
- ✓100% Client-Side electrical engine.
- ✓1-Click Copy power calculations.
Key Terminology & Definitions
Real Power ($P$)
The actual electrical power consumed to do real work (heat, motion, light), measured in Watts (W) or Kilowatts (kW).
Power Factor ($\cos\phi$)
The ratio of real power flowing to the load to the apparent power in the circuit (ranging from 0.0 to 1.0).