1. What is the Power Formula?

The power formula P = V × I calculates electrical power from voltage and current. This fundamental equation in electrical engineering 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:

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

Explanation: The formula shows that power is directly proportional to both voltage and current. Doubling either voltage or current will double the power output.

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, P = V × I directly. For AC circuits, power factor must be considered: P = V × I × PF.

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

Q3: What are typical power values for household appliances?
A: LED bulb: 5-15W, Laptop: 50-100W, Refrigerator: 100-400W, Microwave: 600-1200W.

Q4: Can this formula be rearranged to find voltage or current?
A: Yes, V = P ÷ I and I = P ÷ V. These are useful for circuit design and troubleshooting.

Q5: What safety considerations are important when working with electrical power?
A: Always ensure proper insulation, use appropriately rated components, and follow electrical safety protocols to prevent shocks and fires.