1. What is the Power Equation?

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

3. Importance of Power Calculation

Details: Calculating power is essential for designing electrical circuits, determining energy consumption, selecting appropriate components, 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 are typical voltage values?
A: Common voltages include 1.5V (batteries), 120V (US household), 230V (European household), and 12V (automotive).

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

Q3: Can this calculate current from power and voltage?
A: No, this calculator only computes power. You would need to rearrange the equation (I = P/V) for current.

Q4: What's the difference between AC and DC power?
A: For DC circuits, P = V×I. For AC, you need to consider power factor: P = V×I×PF.

Q5: How accurate is this calculation?
A: The calculation is mathematically exact, but real-world measurements may have instrument errors.