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  2. Energy conversion efficiency - Wikipedia

    en.wikipedia.org/wiki/Energy_conversion_efficiency

    The electrical energy input of this cell is 1.20 times greater than the theoretical minimum so the energy efficiency is 0.83 compared to the ideal cell. A water electrolysis unit operating with a higher voltage that 1.48 V and at a temperature of 25 °C would have to have heat energy removed in order to maintain a constant temperature and the ...

  3. 80 Plus - Wikipedia

    en.wikipedia.org/wiki/80_Plus

    80 Plus (trademarked 80 PLUS) is a voluntary certification program launched in 2004, intended to promote efficient energy use in computer power supply units (PSUs). Certification is acquirable for products that have more than 80% energy efficiency at 20%, 50% and 100% of rated load, and a power factor of 0.9 or greater at 100% load.

  4. Heating element - Wikipedia

    en.wikipedia.org/wiki/Heating_element

    80% Ni, 20% Cr; 60% Ni, 16% Cr; 35% Ni, 20% Cr; Nichrome 80/20 is one of the most commonly used resistance heating alloys because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time. Material beneath this layer will not oxidize, preventing the wire from breaking or burning out.

  5. Mortgage and refinance rates for Nov. 26, 2024: Average rates ...

    www.aol.com/finance/mortgage-and-refinance-rates...

    The current average interest rate for a 30-year fixed mortgage is 7.03% for purchase and 6.99% for refinance, up 8 basis points from 6.96% for purchase and 9 basis points from 6.90% for refinance ...

  6. Economic history of the United States - Wikipedia

    en.wikipedia.org/wiki/Economic_history_of_the...

    Charcoal would have been crushed by the column of material in tall furnaces. Also, the capacity of furnaces would have eventually exceeded the wood supply, as happened with locomotives. [74]: 40–405 Iron was used for a wide variety of purposes. In 1860 large consumers were numerous types of castings, especially stoves.

  7. List of United States presidential elections by popular vote ...

    en.wikipedia.org/wiki/List_of_United_States...

    In a United States presidential election, the popular vote is the total number or the percentage of votes cast for a candidate by voters in the 50 states and Washington, D.C.; the candidate who gains the most votes nationwide is said to have won the popular vote.

  8. Standard deviation - Wikipedia

    en.wikipedia.org/wiki/Standard_deviation

    Suppose that the entire population of interest is eight students in a particular class. For a finite set of numbers, the population standard deviation is found by taking the square root of the average of the squared deviations of the values subtracted from their average value.

  9. List of countries by population (United Nations) - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    Statistical subregions as defined by the United Nations Statistics Division [1]. This is a list of countries and other inhabited territories of the world by total population, based on estimates published by the United Nations in the 2024 revision of World Population Prospects.

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