1. What is the Electric Power Formula?

The basic electric power formula (P = V × I) calculates the power consumption of an electrical device or motor by multiplying voltage (V) by current (I). This fundamental equation is essential for electrical engineering and motor calculations.

2. How Does the Calculator Work?

The calculator uses the basic power equation:

Where:

• \( P \) — Power in watts (W)
• \( V \) — Voltage in volts (V)
• \( I \) — Current in amperes (A)

Explanation: This formula represents the fundamental relationship between voltage, current, and power in electrical systems.

3. Importance of Power Calculation

Details: Calculating power is crucial for designing electrical systems, selecting appropriate wire sizes, determining energy consumption, and ensuring motor safety and efficiency.

4. Using the Calculator

Tips: Enter voltage in volts and current in amps. Both values must be positive numbers. The calculator will compute the power in watts.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between real power and apparent power?
A: This calculator shows real power (watts). Apparent power (VA) includes power factor considerations which aren't accounted for in this basic calculation.

Q2: How does this apply to three-phase motors?
A: For three-phase systems, the formula becomes P = √3 × V × I × PF (power factor). This calculator is for simple DC or single-phase AC calculations.

Q3: What are typical voltage and current values for motors?
A: Small motors might use 12V at 1A (12W), while industrial motors could use 480V at 100A (48,000W).

Q4: How does power relate to motor torque?
A: Power (watts) = Torque (Nm) × Angular Velocity (rad/s). Power calculations help determine motor performance.

Q5: Can I use this for battery calculations?
A: Yes, this can help estimate how long a battery will last by comparing its capacity (Wh) to the power draw.