1. What is PSU Energy Efficiency?

PSU (Power Supply Unit) Energy Efficiency measures how effectively a power supply converts input power to usable output power. It indicates the percentage of input power that is delivered as output power, with the remainder lost as heat.

2. How Does the Calculator Work?

The calculator uses the PSU Energy Efficiency formula:

Where:

• \( Load \) — Output power in watts (W)
• \( Losses \) — Power losses in watts (W)

Explanation: The formula calculates efficiency by comparing useful output power to total input power (output power plus losses).

3. Importance of Energy Efficiency Calculation

Details: Calculating PSU energy efficiency is crucial for evaluating power supply performance, reducing energy consumption, lowering electricity costs, and minimizing heat generation in electronic systems.

4. Using the Calculator

Tips: Enter load power in watts, losses in watts. Both values must be valid positive numbers (load > 0, losses ≥ 0).

5. Frequently Asked Questions (FAQ)

Q1: What is considered good PSU efficiency?
A: Generally, efficiency above 80% is considered good, with 80 Plus certification levels (Bronze, Silver, Gold, Platinum, Titanium) indicating specific efficiency benchmarks.

Q2: How do losses affect efficiency?
A: Higher losses result in lower efficiency as more input power is wasted as heat rather than being delivered as useful output power.

Q3: Does efficiency vary with load?
A: Yes, PSU efficiency typically varies with load percentage, often peaking at around 50-75% of maximum rated load.

Q4: Why is high efficiency important?
A: High efficiency reduces energy costs, decreases heat output (requiring less cooling), and often indicates better component quality and longer product lifespan.

Q5: Can efficiency exceed 100%?
A: No, efficiency cannot exceed 100% as it would violate the law of conservation of energy. The maximum theoretical efficiency is 100%.