1. What is the Power Equation?

The power equation P = I × V calculates electrical power in watts from current (in amperes) and voltage (in volts). It is a fundamental formula in electrical engineering and physics.

2. How Does the Calculator Work?

The calculator uses the power equation:

Where:

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

Explanation: The equation demonstrates the direct relationship between power, current, and voltage in electrical circuits.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for designing electrical systems, determining energy consumption, and ensuring proper sizing of electrical components.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

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

Q2: How is power related to energy consumption?
A: Energy consumption is power multiplied by time (E = P × t), measured in watt-hours or kilowatt-hours.

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

Q4: What are typical household voltage levels?
A: In North America, standard household voltage is 120V, while in Europe it's typically 230V.

Q5: How does wire size affect power transmission?
A: Larger wire sizes reduce resistance and power loss (I²R losses) during electrical transmission.