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The Difference Between Efficiency Level VI and V

International Efficiency Marking Protocol is a system that allows manufacturers to designate the efficiency performance of external power supplies. These designations are identified with a Roman numeral system: I, II, III, IV, VI, V and VI. Historical perspective In the 1990s, external power supplies could have efficiencies as low as 50 percent and still draw power when the appliance was turned off or even disconnected from the power supply. (This is what’s known as “no-load”

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