1. What is the Electrical Power Formula?

The electrical power formula (P = V × I) calculates power in watts by multiplying voltage (in volts) by current (in amperes). This fundamental equation is used to determine the rate of energy transfer in electrical circuits.

2. How Does the Calculator Work?

The calculator uses the power formula:

Where:

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

Explanation: This formula represents the basic relationship between voltage, current, and power in electrical systems according to Ohm's Law.

3. Importance of Power Calculation

Details: Calculating electrical power is essential for circuit design, energy consumption analysis, electrical safety assessments, and determining appropriate component ratings in electrical systems.

4. Using the Calculator

Tips: Enter voltage in volts (V) and current in amperes (A). All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between AC and DC power calculations?
A: For DC circuits, P = V × I directly applies. For AC circuits, power factor must be considered: P = V × I × PF.

Q2: How does this relate to energy consumption?
A: Energy consumption (in watt-hours) is calculated by multiplying power (in watts) by time (in hours).

Q3: Can this formula be used for three-phase systems?
A: For balanced three-phase systems, the formula becomes P = √3 × V × I × PF.

Q4: What are typical power ratings for household appliances?
A: Common household appliances range from 5W (LED bulb) to 3000W (electric heater).

Q5: How is electrical power different from mechanical power?
A: While both measure energy transfer rate, electrical power specifically quantifies the rate of electrical energy conversion.