1. What is Transformer Power?

Transformer power refers to the amount of electrical power that can be transferred through a transformer. It's calculated using the formula P = V × I × cosφ, where V is voltage, I is current, and cosφ is the power factor.

2. How Does the Calculator Work?

The calculator uses the power formula:

Where:

• \( V \) — Voltage in volts
• \( I \) — Current in amps
• \( \cos\phi \) — Power factor (unitless, between 0 and 1)

Explanation: The formula calculates the real power in an AC circuit, accounting for the phase difference between voltage and current.

3. Importance of Power Calculation

Details: Accurate power calculation is crucial for transformer sizing, electrical system design, and energy efficiency assessments.

4. Using the Calculator

Tips: Enter voltage in volts, current in amps, and power factor (between 0 and 1). All values must be valid (voltage > 0, current > 0, 0 ≤ PF ≤ 1).

5. Frequently Asked Questions (FAQ)

Q1: What is power factor?
A: Power factor is the ratio of real power to apparent power, representing the phase difference between voltage and current in AC circuits.

Q2: What is a typical power factor value?
A: For resistive loads it's 1.0, for inductive loads (like motors) it's typically 0.8-0.95, and for capacitive loads it can be leading.

Q3: Why is power factor important?
A: Low power factor means more current is needed for the same real power, increasing energy losses in the system.

Q4: What is apparent power vs real power?
A: Apparent power (VA) is V×I, while real power (W) is V×I×cosφ. The difference is reactive power (VAR).

Q5: How does this apply to transformers?
A: Transformers must be sized based on apparent power (VA rating), but the real power delivered depends on the load's power factor.