1. What is the Power Equation?

The power equation (P = V × I) calculates electrical power in watts from voltage and current. It's one of the fundamental equations in electrical engineering and physics.

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 amps. 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 power and energy?
A: Power is the rate of energy transfer (watts), while energy is power multiplied by time (watt-hours).

Q2: Can I use this for AC circuits?
A: For AC circuits with resistive loads, yes. For reactive loads, you need to consider power factor.

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

Q4: How does this relate to Ohm's Law?
A: Ohm's Law (V = I × R) can be combined with the power equation to give P = I²R or P = V²/R.

Q5: Why is power important for electrical safety?
A: High power devices generate more heat and require proper wiring and cooling to prevent fires.