Conducting liquid to split up the hydrogen the oxygen to glow electric oven a filament to emit light the needle to swing away coil

Winding wire iron rod

2,Ansver the questions:

What effect of electric current do you know?

What is happening, when a current is passed through a conducting liquid?

What effect is used in an electric light bulb?

What effect and when was discovered by the Dane Hans Oersted?

Вправа 1

Дайте відповіді на питання:

- What foreign language do you study at college?

Вправа 2

Прочитайте та перекладіть текст. Знайдіть у тексті речення з неозначеними часовими формами дієслова.

ВИВЧЕННЯ ТЕКСТУ ЗА ФАХОМ. САМОСТІЙНИЙ ПЕРЕКЛАД ТЕКСТУ ЗА ФАХОМ.

2.6 About the First Incandescent Lamp

The first incandescent lamp for practical use was produced in Russia, in 1873 by the greai Russian scientist Alexander Lodygin. In his lamp he fixed a small carbon rod of about 2 mrr in diameter between two copper conductors. In order to protect the lamp from burning through, the lamp's air had been evacuated. Vacuum at the time being far from perfect, this first lamp was short-lived. Its life was measured in hours.

In 1890 Lodygin made his first lamps with a metal filament using metals with high melting points, such as tungsten, molybdenum, osmium.

A few years later Thomas Edison, an American inventor, improved lamps with a metal filament. He used the lamp holder, the switch and some other elements of the lighting network.

Today the filament of the incandescent lamp is twisted into a spiral. The melting point ol tungsten being 3,300°, it can be heated to 3,000°. At this temperature, however, tungsten begins to evaporate. In order to avoid evaporation of tungsten, today lamps are filled with chemically inert gas, i.e. argon or cripton.

In a gas-filled incandescent lamp the ends of a filament are connected to the twc wires passing through the bulb and attached to the metal base. One of the wires i; attached to the base and the other-to the base contact insulated from the base.

Industry manufactures incandescent lamps for 220 and 127 V (for lighting networks), 50 V (for railway wagons), 12 and 6 V (for motor cars), 3.5 and 2.5 V (fo pocket torches).

Exercises

I. Listen to thr tape recorder aid train the following words:

Power, generator, cell, light, addition, switch, protection, fuse, meter; primary, chemical thermal; to utilize, to convert, to deliver, to protect

II. Translate the words and distribute them into three columns (what? what kind of? what to
do?). Mind the suffixes:

power, to power, to add, additional, protection, to protect, protective, utilization, to convert convertible, various, variable, generator, generation

III. Translate the following ward-combinations;

additional power, additional loads, convertible values, converted values, protected powe; source, protecting devices, power increase, various fuses, variable resistor, primary cells, chemica cells

IV. Translate the ward-combinations in writing:

Cells delivering electric power-electric power delivered by the cells; generator converting mechanical energy-heat converted into energy; circuits utilizing common fuses-fuses utilized ir the circuit

Вправа 1

Дайте відповіді на питання:

- What foreign language do you study at college?

Вправа 2

Прочитайте та перекладіть текст. Знайдіть у тексті речення з неозначеними часовими формами дієслова.

Поиск по сайту: