Kilowatt hour

The kilowatt hour (symbol kWh, kW·h, or kW h) is a derived unit of energy equal to 3.6 megajoules. If the energy is being transmitted or used at a constant rate (power) over a period of time, the total energy in kilowatt-hours is the product of the power in kilowatts and the time in hours. The kilowatt-hour is commonly used as a billing unit for energy delivered to consumers by electric utilities.

Definition

The kilowatt-hour (symbolized kW⋅h) is a unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour.

One watt is equal to 1 J/s. One kilowatt-hour is 3.6 megajoules, which is the amount of energy converted if work is done at an average rate of one thousand watts for one hour.

Note that the international standard SI unit of energy is the joule. The hour is a unit of time "outside the SI", so the kilowatt-hour is a non-SI unit of energy. It is not listed among the non-SI units accepted by the BIPM for use with the SI.

Examples

An electric heater rated at 1000 watts (1 kilowatt), operating for one hour uses one kilowatt-hour (equivalent to 3.6 megajoules) of energy. A television rated at 100 watts operating for 10 hours continuously uses one kilowatt-hour. A 40-watt light bulb operating continuously for 25 hours uses one kilowatt-hour.

WH

WH, W.H., or wh may refer to:

Places

  • the code for Westmeath, Ireland
  • Western Hemisphere
  • West Hartford, Connecticut, United States
  • West Hollywood
  • White House
  • Winter Haven, Florida, United States
  • Woodland Hills, California, United States
  • Wuhan, Hubei, China

    Linguistics

  • wh (digraph), a letter combination found in words like when and whale
  • Voiceless labio-velar approximant, the sound used for the above when it is pronounced differently from w
  • Pronunciation of English ⟨wh⟩
  • wh-word, a name for an interrogative word such as where and when
  • wh-movement, a syntactic phenomenon involving such words
  • wh-question, a question formed using such words
  • Other uses

  • W. H. Auden, a twentieth-century poet
  • Mr. W.H., a mysterious dedication in Shakespeare's sonnets
  • Watt-hour, a unit of energy equivalent to 3600 joules
  • The IATA code for China Northwest Airlines
  • Wehrmacht Heer, a code that appears on German World War II army vehicle license plates.
  • Five Ws

    The Five Ws, Five Ws and one H, or the Six Ws are questions whose answers are considered basic in information-gathering. They are often mentioned in journalism (cf. news style), research, and police investigations. They constitute a formula for getting the complete story on a subject. According to the principle of the Five Ws, a report can only be considered complete if it answers these questions starting with an interrogative word:

  • Who did that?
  • What happened?
  • Where did it take place?
  • When did it take place?
  • Why did that happen?
  • Some authors add a sixth question, “how”, to the list, though "how" can also be covered by "what", "when", or "where":

  • How did it happen?
  • Each question should have a factual answer — facts necessary to include for a report to be considered complete. Importantly, none of these questions can be answered with a simple "yes" or "no".

    In the United Kingdom (excluding Scotland), the Five Ws are used in Key Stage 2 and Key Stage 3 lessons.

    History

    Rhetoric

    This section focuses on the history of the series of questions as a way of formulating or analyzing rhetorical questions, and not the theory of circumstances in general.

    Podcasts:

    PLAYLIST TIME:

    Pulse

    by: Minus

    You are a princess
    You were my princess
    You made my heart feel so bad
    It's like you told it to just burn and die
    It's just a crush
    But still it hurts
    It hurts so much
    Your beauty makes perfect sense
    But I feel like I'm out of sync
    I gave it my very best
    I guess it wasn't meant to be




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