Задание 1. Прочитайте текст, переведите устно и выпишите предложения, соответствующие
содержанию текста.
Capacitors.
A capacitor may be defined as a device consisting of two or more conductor plates separated from
one another by a dielectric and used for receiving and storing an electric charge. The effect of a
capacitor in an electric circuit is to oppose any change in the existing voltage.
Capacitors are commonly used in d. с. circuits to reduce the effects of transient voltages and
currents. Electrical transients are high voltages developed from time to time when the circuit is
broken or reconnected, as when a switch is turned on or off. These transient voltages are usually
caused by the inductance of a circuit. In an a. c. circuit the capacitor is often used to block the direct
current but permit the flow of the alternating current. In effect, the alternating current appears to
flow through the capacitor but is actually being stored first on one plate of the capacitor and then on
the other.
Like many other electronic units, capacitors are manufactured in a wide variety of sizes and styles.
Some very low-capacity capacitors are merely tiny wafers of metal separated by an insulator; large
capacitors may weigh several pounds. Fixed capacitors are of two general types. One is the dry
capacitor which consists of metal plates separated by a dry dielectric such as mica or waxed paper,
and the other is the electrolytic capacitor, whose dielectric is a chemical paste or one electrolyte.
The electrolytic capacitor is effective in only one direction. This means that it must be connected in
such a manner that the positive and negative polarities are correct. If it is connected in reverse, the
current will flow through the capacitor and destroy it. Fixed capacitors of both the dry and
electrolytic type are manufactured in a wide variety of shapes and sizes. The electrolytic capacitors
are marked to indicate the correct method of connection into a circuit.
The unit of capacitance is a farad.
Выпишите предложения, соответствующие содержанию текста и переведите:
1. A capacitor may be defined as a device consisting of two or more conductor plates.
2. Capacitors are commonly used in a.с. сcircuits.
3. Large capacitors may weigh several pounds.
4. The electrolytic capacitors are marked to indicate the correct method of connection into a
circuit.
Задание 2. Переведите предложение на русский язык. Напишите данное предложение в Past
и Future Simple, Past и Future Progressive
Neutrons have no electric charge.
Задание 3. Переведите предложение на русский язык. Составьте общий во и во к
подлежащему.
Wires are taken into use in 1888.
When you own a company, you are personally interested in running it efficiently.
The Government influences spending on particular goods and services.
A complex trading organization is based upon a system of credit.
These students are studying the science of economics.
Metal is used in the production of medals.
Your employer (= the company you work for) is responsible for ensuring safety in the workforce.
In fact, Gravers have made us a favour by launching their product first. We can learn from their mistakes.
There are now facilities for training people who have lost their jobs or are threatened with unemployment.
Economics studies the ways in which people apply their knowledge to the gifts of nature in order to satisfy their needs.
Объяснение:
Объяснение:
It was a dark, stormy afternoon during the school holidays and Ann and Tim were watching TV at home, feeling bored. 'I know, Ann! Let's go to the castle.' Tim said excitedly. 'There's a good museum there.'
It was late afternoon when they arrived and they were the only visitors. 'Ooh, it's a bit scary in here!' Ann said as they were walking slowly through the cold, dark rooms of exhibits. 'Don't be silly,' Tim replied.
Suddenly, Tim noticed an interesting exhibit which was a model of a man wearing a very old costume. He stood next to him and Ann took a photo of them with her digital camera, but then when she looked at the screen she couldn't believe her eyes! Tim was standing alone in the photo - the man wasn't next to him! Then, they looked up and saw that the model wasn't in the room any more! It had disappeared!
Ann and Tim ran quickly back to the reception desk. They were terrified! They told the lady there their story. 'Ah-ha! That wasn't a model, that was Henry, the museum ghost,' she said, smiling. Tim looked at Ann. She was completely white!