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4), the perceived energy capacity of a small UPS product that has multiple DC outputs at different voltages but is simply listed with a single ampere-hour rating, e.g., 8800 mAh, would be exaggerated by a factor of 3.75 compared to that of a sealed 12-volt lead-acid battery where the ampere-hour rating, e.g., 7 Ah, is based on the total output ...
A Battery: Eveready 742: 1.5 V: Metal tabs H: 101.6 L: 63.5 W: 63.5 Used to provide power to the filament of a vacuum tube. B Battery: Eveready 762-S: 45 V: Threaded posts H: 146 L: 104.8 W: 63.5 Used to supply plate voltage in vintage vacuum tube equipment. Origin of the term B+ for plate voltage power supplies.
The watt, kilogram, joule, and the second are part of the International System of Units (SI). The hour is not, though it is accepted for use with the SI. Since a watt equals one joule per second and because one hour equals 3600 seconds, one watt-hour per kilogram can be expressed in SI units as 3600 joules per kilogram.
This is a list of commercially-available battery types summarizing some of their characteristics for ready comparison. ... [55] –1,200 [56] 7.2 (139) [57] 4.5 20 ...
Energy; system unit code (alternative) symbol or abbrev. notes sample default conversion combinations SI: yottajoule: YJ YJ 1.0 YJ (2.8 × 10 17 kWh) zettajoule: ZJ ZJ 1.0 ZJ (2.8 × 10 14 kWh)
battery, Lithium-ion [23] [24] 0.46-0.72: 0.83-3.6 [25] 95% [26] battery, Sodium–Nickel Chloride, High Temperature: 0.56: battery, Zinc–manganese (alkaline), long life design [19] [23] 0.4-0.59: 1.15-1.43: battery, Silver-oxide [19] 0.47: 1.8: Flywheel: 0.36-0.5 [27] [28] 5.56 × 45 mm NATO bullet muzzle energy density [clarification needed ...
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This results in a 500 mA USB device running for about 3.7 hours on a 2,500 mAh battery, not five hours. The Board of Trade unit (B.T.U.) [ 17 ] is an obsolete UK synonym for kilowatt-hour. The term derives from the name of the Board of Trade which regulated the electricity industry until 1942 when the Ministry of Power took over. [ 18 ]