Предмет: Математика, автор: koki1501

4.Рассмотри множества. Назови элементы.

Приложения:

Ответы

Автор ответа: binamaksimchuk
49

Ответ:

Пошаговое объяснение:

Множество А состоит из трёх элементов( Атлантический, Индийский,Тихий).

Множество В состоит из четырёх элементов(Жайык , Иле,Шу,Ертис).

Множество С состоит из пяти элементов( моря,озёра,реки,ледники,

океаны).

Множество А является подмножеством  множества С ,так как

Атлантический, Индийский,Тихий- это названия океанов.

Множество В тоже является подмножеством  множества С ,так как

Жайык , Иле,Шу,Ертис- это названия рек в Казахстане.

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Предмет: Английский язык, автор: ImmortalLove
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ALTERNATING CURRENT AND AN ALTERNATOR

In simple forms alternating current generating systems appeared after the
discovery of the magnetic induction of electric current. The early machines were
developed by pioneers such as Michael Faraday and Hippolyte Pixii.
Faraday developed the "rotating rectangle", where each active conductor
passed successfully through regions where the magnetic field was in opposite
directions. Large two-phase alternating current generators were built by a British
electricianJ. Gordon in 1882. Lord Kelvin and Sebastian Ferranti also
developed early alternators, producing frequencies between 100 and 3000 Hz. In
1891 Nikola Tesla patented a practical "high-frequency" alternator, which
operated around 15 kHz. Later alternators were designed for varying alternating
current frequencies between sixteen and one hundred hertz, which could be used
for electric motors.
An alternator is an electromechanical device that converts mechanical
energy to electrical energy in the form of alternating current. Most alternators
use a rotating magnetic field with a stationary armature but sometimes a rotating
armature is used with a stationary magnetic field, or a linear alternator is used
Nowadays alternators can be used in diesel-electric locomotives to provide
power to traction motors, Originally, traction motors and genero Provide
machines. But in the 1960s D,C. generator was repiaced by an alternator usino
diode bridge to convert its output to D.C. This advance greatly improved
locomotive reliability and decreased maintenance costs.