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  2. List of railway electrification systems - Wikipedia

    en.wikipedia.org/wiki/List_of_railway...

    Since 1940. Used both third rail DC (1200 V) and overhead line AC (6.3 kV 25 Hz) until 1955. Also uses German standard 15 kV AC 16 2/3 Hz overhead electrification on the section between Neugraben and Stade on line S3, opened in December 2007.

  3. Southern Railway multiple unit numbering and classification

    en.wikipedia.org/wiki/Southern_Railway_multiple...

    The early AC electric multiple units were referred to by a two-letter code. This was adapted for the DC third-rail system that was adopted by the Southern Railway, with units being given a three-letter code (sometimes two letters) prefixed by the number of cars in each unit, e.g. 4SUB for a four-car suburban unit.

  4. Variable-frequency drive - Wikipedia

    en.wikipedia.org/wiki/Variable-frequency_drive

    Small variable-frequency drive Chassis of above VFD (cover removed). A variable-frequency drive (VFD, or adjustable-frequency drive, adjustable-speed drive, variable-speed drive, AC drive, micro drive, inverter drive, variable voltage variable frequency drive, or drive) is a type of AC motor drive (system incorporating a motor) that controls speed and torque by varying the frequency of the ...

  5. Traction motor - Wikipedia

    en.wikipedia.org/wiki/Traction_motor

    In diesel-electric and gas turbine-electric locomotives, the horsepower rating of the traction motors is usually around 81% that of the prime mover. This assumes that the electrical generator converts 90% of the engine's output into electrical energy and the traction motors convert 90% of this electrical energy back into mechanical energy.

  6. Inverter compressor - Wikipedia

    en.wikipedia.org/wiki/Inverter_compressor

    In air conditioning, an inverter compressor is a compressor that is operated with an inverter. In the hermetic type, it can either be a scroll or reciprocating compressor . This type of compressor uses a drive to control the compressor motor speed to modulate cooling capacity.

  7. Costco Just Issued a Recall on This Popular Cold & Flu Medicine

    www.aol.com/costco-just-issued-recall-popular...

    Costco announced a recall of Kirkland Severe Cold & Flu Capsules due to the potential of foreign material contamination.

  8. Biden says not taking more credit for accomplishments is key ...

    www.aol.com/biden-says-not-taking-more-125646426...

    President Joe Biden said a key regret of his four years in office was not taking more credit — and reminding voters — of his administration’s accomplishments, including infrastructure and ...

  9. Power inverter - Wikipedia

    en.wikipedia.org/wiki/Power_inverter

    Inverter designed to provide 115 V AC from the 12 V DC source provided in an automobile. The unit shown provides up to 1.2 amperes of alternating current, or enough to power two 60 W light bulbs. An inverter converts the DC electricity from sources such as batteries or fuel cells to AC electricity. The electricity can be at any required voltage ...

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