1. What is Electrical Power?

Electrical power is the rate at which electrical energy is transferred by an electric circuit. It is measured in watts (W) and represents the amount of energy consumed or produced per unit time.

2. How Does the Calculator Work?

The calculator uses the electrical power formula:

Where:

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

Explanation: This fundamental equation shows that electrical power is the product of voltage and current in a circuit.

3. Importance of Power Calculation

Details: Calculating electrical power is essential for designing electrical systems, determining energy consumption, sizing electrical components, and ensuring circuit safety.

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 AC and DC power calculation?
A: For DC circuits, P = V × I directly. For AC circuits, power factor must be considered: P = V × I × PF.

Q2: How is electrical power related to energy?
A: Energy = Power × Time. Power measured in watts, energy measured in watt-hours or joules.

Q3: What are typical power ratings for household appliances?
A: Common appliances range from 10W (LED bulb) to 3000W (electric heater). Always check manufacturer specifications.

Q4: Why is power calculation important for circuit design?
A: Proper power calculation ensures wires, fuses, and components are appropriately sized to handle the electrical load safely.

Q5: Can this formula be used for three-phase systems?
A: For balanced three-phase systems, use P = √3 × V × I × PF, where V is line voltage and I is line current.