1. What is AC Power Calculation?

Definition: This calculator computes the real power in an AC circuit based on RMS voltage, RMS current, and power factor.

Purpose: It helps electrical engineers, technicians, and students determine the actual power consumption in AC systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P \) — Real power (watts)
• \( V_{rms} \) — Root mean square voltage (volts)
• \( I_{rms} \) — Root mean square current (amps)
• \( PF \) — Power factor (unitless, between 0 and 1)

Explanation: The product of voltage and current gives apparent power, which is then scaled by the power factor to get real power.

3. Importance of AC Power Calculation

Details: Accurate power calculation ensures proper equipment sizing, energy efficiency, and electrical system safety.

4. Using the Calculator

Tips: Enter the RMS voltage in volts, RMS current in amps, and power factor (default 1.0 for purely resistive loads). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is power factor?
A: Power factor is the ratio of real power to apparent power, representing how effectively current is being converted into useful work.

Q2: What's a typical power factor value?
A: For purely resistive loads it's 1.0, for inductive loads (like motors) it's typically 0.7-0.9, and for capacitive loads it can be leading.

Q3: How do I measure RMS voltage and current?
A: Use a true-RMS multimeter or clamp meter for accurate measurements in AC circuits.

Q4: What's the difference between real, apparent, and reactive power?
A: Real power does work, apparent power is the product V×I, and reactive power is the non-working power in inductive/capacitive circuits.

Q5: Why is power factor important?
A: Low power factor means inefficient power usage and may result in utility penalties for commercial customers.