Power Engineering. Соколова Е.В. - 40 стр.

времен

       1 .It was found that there were three types of coils used in core type transform-
ers. 2. We knew that a dynamo consisted of two essential parts: the field magnet
which produced the magnetic field and the armature winch carried the conductors. 3.
We saw at once that the inductance of a coil, and therefore also its inductive reac-
tance, were increased when an iron core was put into it. 4. She was asked i. It new
Ohm's law. 5. It was proved that radio had been invented by A.S Popov. 6. As a result
he established the nuclear theory of atomic line and proved that the atom consisted of
electrons revolving around a very small but very heavy nucleus. 7. It was reported
that practically all the vacuum tubes used in radio work would depend upon the ther-
mionic conduction for their operation. 8. It was apparent that there was no sharp line
of demarcation between conductors and insulators. 9. The physicists assumed that the
proton would have the same mass as the electron. 10. Marie Curie found that the ore
from which uranium is obtained, gave off rays four times as strong as those of pure
uranium
       14.5 Переведите предложения, обращая внимание на инфинитивные
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       1. A vacuum tube is a device consisting of a number of electrodes contained
within an evacuated bulb. 2. Increasing the voltage across a resistor, we increase the
current which flows through the resistor. 3. The heat produced per second depends
both upon the resistance of the conductor and upon the amount of current flowing
through it.4. Perhaps the most widely used source of power in large power plants is
the steam turbine. 5. Capacity is one of the important properties greatly affecting an
electric circuit. 6. The voltage being increased, the field becomes strong enough to
cause the electrons to produce additional ions by collision. 7. Using transformer you
can increase or decrease the voltage of the alternating current. 8. The energy supplied
by the light is sufficient to cause emission from some substances. 9. The fact that a
small voltage acting on the grid is equivalent to a large voltage acting on the plate in-
dicates the possibility of amplification with the triode tube. 10. The polarity of the
poles does not change, those on one side being permanently of north polarity, those
on the other side of south polarity. 11. Part of the energy being changed into heat, not
all the chemical energy of the cell or battery is transformed into electric energy. 12.
The crowded electrons on the zinc plate of the cell tend to move towards the copper
one because of the electrical pressure created. 13. The process by which the signal be-
ing transmitted is reproduced from the radio-frequency currents present at the re-
ceiver is called detection, or sometimes demodulation. 14. While experimenting in
their laboratory Pierre and Marie Curie discovered a new ray-shooting element—
radium. 15. Two or more cells connected together constitute a battery. 16. A current
passing through the winding of a solenoid acquires magnetic properties. 17. In this
way it is possible to make strong magnets that are called electromagnets, the strength
of the electromagnet depending on the kind of iron placed within the coil. 18. Being
subjected to radiation, various substances undergo radical changes of their properties.
19. Sometimes a transformer is used merely to insulate two electrical circuits while
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