1. What is the Power Formula?

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

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.

3. Importance of Power Calculation

Details: Calculating power is essential for designing electrical circuits, selecting appropriate components, and ensuring electrical safety. It helps determine energy consumption and efficiency.

4. Using the Calculator

Tips: Enter voltage in volts and current in amperes. Both values must be positive numbers. The calculator will compute the power in watts.

5. Frequently Asked Questions (FAQ)

Q1: What are typical voltage values?
A: Common voltages include 1.5V (batteries), 5V (USB), 12V (automotive), 120V (US household), and 230V (European household).

Q2: How does power relate to energy?
A: Power is the rate of energy transfer. Energy (in watt-hours) = Power × Time.

Q3: What's the difference between AC and DC power?
A: The formula works for both, but for AC, you often use RMS values for voltage and current.

Q4: Can I calculate current if I know power and voltage?
A: Yes, rearrange the formula: I = P / V.

Q5: What about three-phase power?
A: Three-phase power uses a different formula: P = √3 × V × I × PF (where PF is power factor).