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80–90% [26] Nickel–metal hydride battery: Chemical to electrical/reversible 66% [27] Lead-acid battery: Chemical to electrical/reversible 50–95% [28] Pumped-storage hydroelectricity: gravitational to electrical/reversible 70–85% [29] Engine/motor: Combustion engine: Chemical to kinetic 10–50% [30] Electric motor: Electrical to kinetic
80 Plus (trademarked 80 PLUS) is a voluntary certification program launched in 2004, intended to promote efficient energy use in computer power supply units (PSUs). Certification is acquirable for products that have more than 80% energy efficiency at 20%, 50% and 100% of rated load, and a power factor of 0.9 or greater at 100% load.
The following table gives the efficiency for several engines when running at 80% throttle, which is approximately what is used in cruising, giving a minimum SFC. The efficiency is the amount of power propelling the plane divided by the rate of energy consumption. Since the power equals thrust times speed, the efficiency is given by
The current average interest rate for a 30-year fixed mortgage is 6.80% for purchase and 6.80% for refinance — down 16 basis points from 6.96% for purchase and 18 basis points from 6.98% for ...
The potential worldwide savings in health care costs have been estimated at trillions of dollars annually. ... with onshore wind dominating at 80% of total ...
The fixed rate for a 15-year mortgage is 5.96%, down 14 basis points from last week's average 6.10%. These figures are lower than a year ago, when rates averaged 7.03% for a 30-year term and 6.29% ...
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