1. What is the Power Formula?

The power formula (W = V × I) calculates electrical power in watts from voltage and current. It represents the rate at which electrical energy is transferred by an electric circuit.

2. How Does the Calculator Work?

The calculator uses the power formula:

Where:

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

Explanation: This fundamental equation in electrical engineering shows that power is directly proportional to both voltage and current.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for circuit design, energy consumption analysis, electrical safety assessments, 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 AC and DC power calculation?
A: For DC circuits, power is simply V × I. For AC circuits, power calculation requires considering power factor (P = V × I × PF).

Q2: How does power relate to energy consumption?
A: Energy consumption (in watt-hours) is power (in watts) multiplied by time (in hours). This is how electricity usage is typically measured.

Q3: What are typical power ratings for household appliances?
A: Common appliances range from 5-10W (LED bulbs) to 1000-3000W (heaters, air conditioners). Always check manufacturer specifications.

Q4: Why is power calculation important for electrical safety?
A: Calculating power helps determine proper wire sizing, circuit breaker ratings, and prevents overload conditions that could cause fires.

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