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  2. Space heater - Wikipedia

    en.wikipedia.org/wiki/Space_heater

    In the United States, Underwriters Laboratories' UL 1278 [11] (for portable electric space heaters) and UL 1042 [12] standards (for portable and fixed baseboard electric heaters) certify heater safety. Although the General Services Administration had Specification W-H-193 [13] for

  3. Electric heating - Wikipedia

    en.wikipedia.org/wiki/Electric_heating

    Electric heating is a process in which electrical energy is converted directly to heat energy. Common applications include space heating, cooking, water heating and industrial processes. An electric heater is an electrical device that converts an electric current into heat. [1]

  4. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    The following tubes were used in post-World War II walkie-talkies and pocket-sized portable radios. All have 1.25 volt DC filaments and directly heated cathodes. Some specify which end of the filament is to be powered by the positive side of the filament power supply (usually a battery).

  5. AC/DC receiver design - Wikipedia

    en.wikipedia.org/wiki/AC/DC_receiver_design

    There are three ways of powering electronic equipment. AC-only equipment would rely on a transformer to provide the voltages for heater and plate circuits. AC/DC equipment would connect all the tube heaters in series to match the supply voltage; a rectifier would convert AC to the direct current required for operation. When connected to a DC ...

  6. IEC 60309 - Wikipedia

    en.wikipedia.org/wiki/IEC_60309

    This allows one to choose single-phase AC power at either 110–120 volts between phase and neutral or 220–240 volts between phase and phase. Since these two modes do not need three phases there is also a dark yellow-orange four-pin connector available designed for a single-phase 110–120 or 220–240 volt load.

  7. Patio heater - Wikipedia

    en.wikipedia.org/wiki/Patio_heater

    Hanging patio heater: portable and small footprint; comes in electric only; Tabletop patio heater: ultra-portable and great for smaller groups or outdoor dining, but it uses a small propane tank; Patio heaters have become popular with bars and restaurants, since they extend the day and the season for their customers to sit outdoors.

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