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  2. Polarity (mutual inductance) - Wikipedia

    en.wikipedia.org/wiki/Polarity_(mutual_inductance)

    In the "subtractive" arrangement, the H1 and X1 terminals are adjacent, and the voltage measured between H2 and X2 would be the difference of the high voltage and low voltage windings. [3] Pole mounted distribution transformers are manufactured with additive polarity, while instrument transformers are made with subtractive polarity.

  3. Current transformer - Wikipedia

    en.wikipedia.org/wiki/Current_transformer

    A current transformer has a primary winding, a core, and a secondary winding, although some transformers use an air core. While the physical principles are the same, the details of a "current" transformer compared with a "voltage" transformer will differ owing to different requirements of the application.

  4. Transformer effect - Wikipedia

    en.wikipedia.org/wiki/Transformer_effect

    The transformer effect, or mutual induction, is one of the processes by which an electromotive force (e.m.f.) is induced. In a transformer , a changing electric current in a primary coil creates a changing magnetic field that induces a current in a secondary coil.

  5. Leakage inductance - Wikipedia

    en.wikipedia.org/wiki/Leakage_inductance

    Leakage inductance has the useful effect of limiting the current flows in a transformer (and load) without itself dissipating power (excepting the usual non-ideal transformer losses). Transformers are generally designed to have a specific value of leakage inductance such that the leakage reactance created by this inductance is a specific value ...

  6. Per-unit system - Wikipedia

    en.wikipedia.org/wiki/Per-unit_system

    The ratio of the voltage bases on either side of a transformer is selected to be the same as the ratio of the transformer voltage ratings. With these two rules, a per-unit impedance remains unchanged when referred from one side of a transformer to the other. This allows the ideal transformer to be eliminated from a transformer model.

  7. NYT ‘Connections’ Hints and Answers Today, Tuesday, February 11

    www.aol.com/nyt-connections-hints-answers-today...

    Related: 300 Trivia Questions and Answers to Jumpstart Your Fun Game Night. Ready for the answers? Scroll below this image (the image that represents your very appreciated patience!).

  8. Can asking 36 questions lead to love? The couple behind this ...

    www.aol.com/asking-36-questions-lead-love...

    Psychologists Arthur and Elaine Aron are known for research behind the “36 Questions That Lead to Love.” They share how their relationship has lasted over 50 years.

  9. 270 Reasons Women Choose Not To Have Children - The ...

    data.huffingtonpost.com/2015/07/choosing-childfree

    The number of childfree women is at a record high: 48 percent of women between the ages of 18 and 44 don’t have kids, according to 2014 Census numbers. The Huffington Post and YouGov asked 124 women why they choose to be childfree.