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  2. Per-unit system - Wikipedia

    en.wikipedia.org/wiki/Per-unit_system

    The base value should only be a magnitude, while the per-unit value is a phasor. The phase angles of complex power, voltage, current, impedance, etc., are not affected by the conversion to per unit values. The purpose of using a per-unit system is to simplify conversion between different transformers.

  3. Irreducible fraction - Wikipedia

    en.wikipedia.org/wiki/Irreducible_fraction

    For example, ⁠ 1 / 4 ⁠, ⁠ 5 / 6 ⁠, and ⁠ −101 / 100 ⁠ are all irreducible fractions. On the other hand, ⁠ 2 / 4 ⁠ is reducible since it is equal in value to ⁠ 1 / 2 ⁠, and the numerator of ⁠ 1 / 2 ⁠ is less than the numerator of ⁠ 2 / 4 ⁠. A fraction that is reducible can be reduced by dividing both the numerator ...

  4. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    By using a dot to divide the digits into two groups, one can also write fractions in the positional system. For example, the base 2 numeral 10.11 denotes 1×2 1 + 0×2 0 + 1×2 −1 + 1×2 −2 = 2.75 .

  5. Metrication - Wikipedia

    en.wikipedia.org/wiki/Metrication

    The People's Republic of China has defined these units so that conversion factors to SI are simple fractions or whole numbers. (See the article on Chinese units of measurement for differences in definitions between the PRC, ROC, and other Sinosphere countries and regions.) 1926 Afghanistan [114] Afghan (Persian, Arab, Indian) Metric 1929 Estonia

  6. Credit card - Wikipedia

    en.wikipedia.org/wiki/Credit_card

    A large fraction of junk mail consists of the credit card offers created from lists provided by the major credit reporting agencies. In the United States, the three major U.S. credit bureaus (Equifax, TransUnion and Experian) allow consumers to opt out from related credit card solicitation offers via its Opt Out Pre Screen program.

  7. Electric power transmission - Wikipedia

    en.wikipedia.org/wiki/Electric_power_transmission

    US transmission and distribution losses were estimated at 6.6% in 1997, [28] 6.5% in 2007 [28] and 5% from 2013 to 2019. [29] In general, losses are estimated from the discrepancy between power produced (as reported by power plants) and power sold; the difference constitutes transmission and distribution losses, assuming no utility theft occurs.