heat battery
21VRLA battery — A valve regulated (sealed) lead–acid battery A VRLA battery (valve regulated lead–acid battery) is a type of low maintenance lead–acid rechargeable battery. Because of their construction, VRLA batteries do not require regular addition of water to …
22Zinc–air battery — specific energy 470 (practical),1370 (theoretical) Wh/kg[1][2] (1.692, 4.932 MJ/kg) energy density 1480 9780 Wh/L[c …
23Nine-volt battery — Duracell PP3 (9 volt) battery Collage of images show …
24PP3 battery — A PP3 battery, commonly referred to simply as a nine volt battery , is shaped as a rounded rectangular prism and has a nominal output of nine volts. Its nominal dimensions are 48 mm × 25 mm × 15 mm (ANSI standard 1604A). It is widely used in… …
25Nickel-cadmium battery vented cell type — Vented cell (wet cell, flooded cell) is a type of nickel cadmium battery that is used when large capacities and discharge rates are required. The term vented refers to a difference to common NiCd batteries which are sealed .They are used in… …
26Unit of heat — Unit U nit, n. [Abbrev. from unity.] 1. A single thing or person. [1913 Webster] 2. (Arith.) The least whole number; one. [1913 Webster] Units are the integral parts of any large number. I. Watts. [1913 Webster] 3. A gold coin of the reign of… …
27Compaq Presario 1200 — A Compaq Presario 1200 Series notebook with 12 LCD The Compaq Presario 1200 Series was a line of notebook computers produced between 1998 and 2000 by Compaq. They were originally noted for their AMD processors, light weight and 12 inch LCD… …
28Fuel cell — For other uses, see Fuel cell (disambiguation). Demonstration model of a direct methanol fuel cell. The actual fuel cell stack is the layered cube shape in the center of the image A fuel cell is a device that converts the chemical energy from a… …
29Laptop — A desktop replacement laptop with its 18.4 inch screen showing its technical specifications. A laptop, also called a notebook,[1][2] is a personal computer for …
30Vacuum tube — This article is about the electronic device. For experiments in an evacuated pipe, see free fall. For the transport system, see pneumatic tube. Modern vacuum tubes, mostly miniature style In electronics, a vacuum tube, electron tube (in North… …
