1. What is the Electric Power Formula?

The electric power formula P = V × I calculates electrical power in DC circuits or apparent power in AC circuits. It represents the rate at which electrical energy is transferred by an electric circuit.

2. How Does the Calculator Work?

The calculator uses the fundamental power formula:

Where:

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

Explanation: This formula expresses the relationship between voltage, current, and power in electrical systems, where power equals the product of voltage and current.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for circuit design, electrical safety, energy consumption analysis, and proper sizing of electrical components and systems.

4. Using the Calculator

Tips: Enter voltage in volts and current in amperes. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between real power and apparent power?
A: In AC circuits, real power (P) is the actual power consumed, while apparent power (S) includes both real and reactive power. P = V × I gives apparent power in AC.

Q2: Can this formula be used for both AC and DC circuits?
A: Yes, for DC circuits it gives actual power, for AC circuits it gives apparent power (need power factor for real power).

Q3: What are typical power values in household applications?
A: Small electronics: 5-100W, Lighting: 10-200W, Appliances: 500-3000W, Heating: 1000-5000W.

Q4: How does power relate to energy consumption?
A: Energy = Power × Time. Power measured in watts, energy in watt-hours (Wh) or kilowatt-hours (kWh).

Q5: What safety considerations are important for power calculations?
A: Ensure components can handle calculated power, consider heat dissipation, and follow electrical codes for safe operation.