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The unit for power is the watt (symbol: W). Apparent power is often expressed in volt-amperes (VA) since it is the product of RMS voltage and RMS current. The unit for reactive power is var, which stands for volt-ampere reactive. Since reactive power transfers no net energy to the load, it is sometimes called "wattless" power.
Volts: voltage or volt; Current: DC = direct current # Hz = frequency in hertz (alternating current (AC)) AC supplies are usually single-phase (1φ) except where marked three-phase (3φ). Conductors: overhead line or; conductor rail, usually a third rail to one side of the running rails. Conductor rail can be:
Innovations in the latter half of the 20th century allowed more ubiquitous air conditioner use. In 1945, Robert Sherman of Lynn, Massachusetts, invented a portable, in-window air conditioner that cooled, heated, humidified, dehumidified, and filtered the air. [37] The first inverter air conditioners were released in 1980–1981. [38] [39]
The most commonly used insulation type in AC electrical distribution systems throughout North America is THHN ("Thermoplastic High Heat-resistant Nylon-coated" [17]). This is a specification for PVC insulation (other thermoplastics are permitted, but rarely used) with a nylon jacket for abrasion resistance.
Type C requires adaptor. Hotel bathrooms may have shaver supply units (but usually not in homes). Type M is used mainly for air conditioners, ovens, clothes dryers and some high-powered industrial/office equipment. Slovakia: C, E, F STN 34 4516 230 V 400 V 50 Hz Slovenia: C, F 230 V 400 V 50 Hz Solomon Islands: G, I AS/NZS 3112 230 V
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