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Vintage PP3-size 9-volt batteries Size comparison of batteries: D, C, AA, AAA, AAAA, 9-volt (PP3) The nine-volt battery, or 9-volt battery, is an electric battery that supplies a nominal voltage of 9 volts. Actual voltage measures 7.2 to 9.6 volts, depending on battery chemistry.
Philco Socket Power A & B Battery Eliminators - 1925 August brochure Philco Model B-60 "B" Socket Power Battery Eliminator - August 1925. Until the mid- to late-1920s, all radios except crystal sets were powered by vacuum tube batteries which were expensive, needed frequent charging, and leaked battery acid, reducing the wife approval factor in ...
In battery-powered equipment, a battery eliminator circuit (BEC) is an electronic voltage regulator used to power a subsystem at a different voltage without the need for a supplemental battery. BECs are commonly used in radio-controlled models , which need separate voltages to power the motor and the RC equipment.
Common absorption refrigerators use a refrigerant with a very low boiling point (less than −18 °C (0 °F)) just like compressor refrigerators.Compression refrigerators typically use an HCFC or HFC, while absorption refrigerators typically use ammonia or water and need at least a second fluid able to absorb the coolant, the absorbent, respectively water (for ammonia) or brine (for water).
November 1925 magazine ad for battery eliminator. A battery eliminator is an adapter intended to allow a device intended for battery operation, such as a radio, to be operated from an AC outlet. [10] All radios, except crystal sets, used inconvenient and messy vacuum tube batteries until the mid- to late-1920s. Battery eliminators that plugged ...
A "battery eliminator" was then a literal name, as it replaced an existing battery and usually fitted into a case exactly the same size, so that it could be placed in the same compartment. These were sold commercially, also made by hobbyists.