1. What is the Power Equation?

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

2. How Does the Calculator Work?

The calculator uses the power equation:

Where:

• \( W \) — Power in Watts
• \( I \) — Current in Amperes (Amps)
• \( V \) — Voltage in Volts

Explanation: The equation shows the direct relationship between current, voltage, and power in an electrical circuit.

3. Importance of Power Calculation

Details: Calculating power is essential for designing electrical systems, selecting appropriate components, and ensuring safety in electrical installations.

4. Using the Calculator

Tips: Enter current in amps and voltage in volts. Both values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between real power and apparent power?
A: This calculator gives real power (watts). Apparent power (VA) includes phase angle differences in AC circuits.

Q2: Does this work for both AC and DC circuits?
A: For DC circuits, it's exact. For AC circuits, it gives real power only if current and voltage are in phase (power factor = 1).

Q3: How does this relate to transformer sizing?
A: Transformers are rated in VA (volt-amps), which considers both real and reactive power in AC systems.

Q4: What if I know watts and volts but need amps?
A: Rearrange the equation: I = W/V. This is useful for circuit breaker sizing.

Q5: Why is power calculation important for transformers?
A: Proper transformer sizing requires accurate power calculations to prevent overload and ensure efficient operation.