1. What is the Power Equation?

The power equation (P = V × I) calculates electrical power in watts from voltage and current. It's a fundamental equation in electrical engineering and physics that relates these three basic electrical quantities.

2. How Does the Calculator Work?

The calculator uses the power equation:

Where:

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

Explanation: The equation 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, determining energy consumption, and ensuring electrical safety.

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's the difference between watts, volts, and amps?
A: Volts measure electrical potential, amps measure current flow, and watts measure power (rate of energy transfer).

Q2: Can I calculate current if I know power and voltage?
A: Yes, you can rearrange the equation: I = P / V.

Q3: What are typical household voltages?
A: In North America, 120V is standard. In Europe and many other regions, 230V is standard.

Q4: How does this relate to energy consumption?
A: Energy (in watt-hours) = Power (watts) × Time (hours). This is what utility companies bill you for.

Q5: What's the power factor and why isn't it included?
A: This simple formula assumes purely resistive loads. For AC circuits with reactive components, power factor becomes important (P = V × I × PF).