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Вариант 3 1) Translate the following text: INSULATORS AND INSULATING MATERIALS Insulators are a class of substances which offer an extremely high res
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Вариант 3
1) Translate the following text:
INSULATORS AND INSULATING MATERIALS
Insulators are a class of substances which offer an extremely high resistance to the passage of current. An insulator is also called a dielectric. It has very few free charges that are able to move under the influence of the electric field.
Insulating materials include practically all the non-metallic substances. They include wood, glass, porcelain, wax, Cotton, silk, asbestos, rubber, mica, etc. Air is a very good insulator when dry.
The choice for a particular purpose depends upon one or more properties such as dielectric and mechanical strength, flexibility and ability to withstand a rise in temperature. Many insulators, such as silk, cotton and asbestos, are excellent when dry but deteriorate rapidly when moisture is absorbed.
All insulators carry a certain small leakage current, they act as an extremely high resistance which is called the ♦insulation resistance* of the system.
There are two leakage paths in most electrical systems: (1) that between the conductors and (2) that from the conductors to earth.
The principal enemies of good insulation are moisture, high temperature and mechanical damage.
НЕПРОВОДНИКИ И ИЗОЛЯЦИОННЫЕ МАТЕРИАЛЫ
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