Прочитайте текст и заполните пропуски подходящими по смыслу словами. This is the widest field of eng...: ответ на тест 1046345 - Английский язык

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This is the widest field of engineering, concerned with systems and devices that use 1_______ power and signals. Among the most 2_______ subjects in the field are electric power and machinery, electronic circuits, control systems, computer design, superconductors, solid-state electronics, robotics, lasers, 3_______, consumer electronics, and fibre optics.
Electrical engineering can be divided into four 4_______ branches: electric power and machinery, electronics, communications and control, and computers.

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Electrical engineering
1. Electricity has been a subject of scientific interest since at least the early 17th century. The first electrical engineer was probably William Gilbert who designed the versorium: a device that detected the presence of statically charged objects. He was also the first to draw a clear distinction between magnetism and static electricity and is credited with establishing the term electricity. In 1775 Alessandro Volta's scientific experimentations devised the electrophorus, a device that produced a static electric charge, and by 1800 Volta developed the voltaic pile, a forerunner of the electric battery.
2. Electrical engineering is a field of engineering that generally deals with the study and application of electricity, electronics, and electromagnetism. This field first became an identifiable occupation in the latter half of the 19th century after commercialization of the electric telegraph, the telephone, and electric power distribution and use. It now covers a wide range of subfields including electronics, digital computers, power engineering, telecommunications, control systems, RF engineering, and signal processing.
3. Electrical engineering may include electronic engineering. Where a distinction is made, usually outside of the United States, electrical engineering is considered to deal with the problems associated with systems such as electric power transmission and electrical machines, whereas electronic engineering deals with the study of electronic systems including computers, communication systems, integrated circuits, and radar. From a different point-of-view, electrical engineers are usually concerned with using electricity to transmit electric power, while electronic engineers are concerned with using electricity to process information.
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What does electrical engineering concerned with mainly?

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The electrical system in a car can have either a positive or a negative 1_______. In both systems, the battery leads and terminals must be connected 2_______.
In a car with a positive earth, the positive terminal must be connected to the car body. The negative terminal must be connected to the electrical 3_______.
In a car with a negative earth, the positive terminal must be connected to the electrical system. The negative terminal must be connected to the 4_______ body.

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What is the density of water?
Density (specific weight) is the amount of mass in a unit volume. It is measured in kilograms per cubic metre. The density of water is 1000 kg/m3 but most materials have a higher density and sink in water. Aluminium alloys, with typical densities around 2800 kg/m3 are considerably less dense than steels, which have typical densities around 7800 kg/m3. Density is important in any application where the material must not be heavy.

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What is the slower speed of the ZX 1000 electric drill?
The ZX 1000 electric drill has two speeds: the fast speed is 3,000 rpm and the slower speed is 1,000 rpm. Adjust the speed according to the type of material and the size of the hole. For example, use the faster speed for a soft material such as wood to drill holes smaller than 10 millimetres (10 mm) in diameter but choose the slower speed for holes between 10 and 25 mm. However, for steel, a hard material, use the faster speed for holes smaller than 6.5 mm and choose the slower speed to drill holes between 6.5 and 10 mm.

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Water is not used in refrigerators. Why?
Water is not used in refrigerators because it evaporates too slowly. Ether, another refrigerant, is never used in domestic refrigerators since it is both poisonous and inflammable. However, it is sometimes used for industrial refrigeration because it evaporates very fast. Freon is usually used in domestic refrigerators as it evaporates fast, is non-toxic, and non-flammable.