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PSU Efficiency Formula:
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PSU (Power Supply Unit) efficiency measures how effectively a power supply converts input power to usable output power. It's calculated as the ratio of output power to input power, expressed as a percentage.
The calculator uses the efficiency formula:
Where:
Explanation: The formula calculates what percentage of the input power is successfully converted to usable output power, with the remainder typically lost as heat.
Details: Calculating PSU efficiency is crucial for energy conservation, reducing electricity costs, minimizing heat generation, and ensuring optimal performance of electronic systems. Higher efficiency PSUs are more environmentally friendly and cost-effective to operate.
Tips: Enter both output and input power values in watts. Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is a good PSU efficiency rating?
A: For UK applications, look for 80 Plus certified PSUs: Bronze (82-85%), Silver (85-88%), Gold (87-90%), Platinum (90-92%), or Titanium (90-94%) at typical loads.
Q2: Why does efficiency matter for UK users?
A: Higher efficiency means lower electricity bills and reduced environmental impact, which is particularly important given UK energy prices and sustainability goals.
Q3: How does voltage affect PSU efficiency in the UK?
A: UK's 230V mains voltage typically allows PSUs to operate more efficiently compared to 110V systems, as higher voltages reduce current and associated losses.
Q4: Are there UK regulations for PSU efficiency?
A: Yes, the UK follows EU Ecodesign regulations (Lot 6/9) which set minimum efficiency requirements for power supplies sold in the market.
Q5: Should efficiency be measured at full load?
A: Efficiency should be measured across various load levels (20%, 50%, 100%) as PSUs typically reach peak efficiency at around 50-80% of their rated capacity.