Therefore, many providers may boast all sorts of references.
Electric power is the product of two quantities: current and voltage.
These two quantities can vary with respect to time (AC power) or can be kept at constant levels (DC power). Most refrigerators, air conditioners, pumps and industrial machinery use AC power whereas most computers and digital equipment use DC power (the digital devices you plug into the mains typically have an internal or external power adapter to convert from AC to DC power).
So in power systems where generation is distant from the load, it is desirable to step-up (increase) the voltage of power at the generation point and then step-down (decrease) the voltage near the load.Secondly, it is often more economical to install turbines that produce higher voltages than would be used by most appliances, so the ability to easily transform voltages means this mismatch between voltages can be easily managed. Solid state devices, which are products of the semiconductor revolution, make it possible to transform DC power to different voltages, build brushless DC machines and convert between AC and DC power.
The kilowatt hour (symbol kWh, kW?h, or kW h) is a derived unit of energy equal to 3.6 megajoules.
The kilowatt-hour is commonly used as a billing unit for energy delivered to consumers by electric utilities. The symbol "kWh" is commonly used in commercial, educational, scientific and media publications, and is the usual practice in electrical power engineering. Other abbreviations and symbols may be encountered: "kW h" is less commonly used.It is consistent with SI standards (but note that the kilowatt-hour is a non-SI unit).
The international standard for SI states that in forming a compound unit symbol, "Multiplication must be indicated by a space or a half-high (centered) dot (?), since otherwise some prefixes could be misinterpreted as a unit symbol" (i.e., kW h or kW?h).This is supported by a voluntary standard6 issued jointly by an international (IEEE) and national (ASTM) organization.
One guide published by NIST specifically recommends avoiding "kWh" "to avoid possible confusion". The US official fuel-economy window sticker for electric vehicles uses the abbreviation "kW-hrs". Variations in capitalization are sometimes seen: KWh, KWH, kwh etc. "kW?h" is, like "kW h", preferred with SI standards, but it is very rarely used in practice. The notation "kW/h", as a symbol for kilowatt-hour, is not correct. Źródło: https://en.wikipedia.org/wiki/Kilowatt_hour.