Вопрос № 347273 - Английский язык

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It’s difficult to speak about music in general, because it will either take a lot of time or just one sentence to explain our attitude. Music is an integral part of our life. It is varied because it reflects different human emotions. If we ask several people what kind of music they like, all of them will give different answers. Tastes differ. But the world of music is boundless and everybody can find there something that satisfies his tastes and demands. And all the people will agree that our world will be dull without music.

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Music is an integral part of our life. We enjoy music because it influences our mood and imagination, reflects our inner state and character, arouses deep emotions and makes us think. It helps us to remove from tiredness and tension or find new strength, get new energy and optimism. That’s why we can say that all kinds of music are popular with public: classical and pop music, folk music and jazz, operas, musicals, orchestral performances, chamber music, rock and roll, heavy metal, rap, rock, hard rock, rave and so on. For this reason music festivals which are held annually gather large audience.

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The triode, or three electrode tube, is an elaboration of the diode.
The diode consists of two electrodes. They also appear in the triode and they constitute the basis of the triode. In the triode the third electrode (the control grid) is added in the space between the emmitter and the plate.
The control grid is a metal structure which may be of different shape, depending upon the design of the tube.
The basic function of the triode is to amplify the current, or voltage or electric power. In this process of amplification the control grid plays a most important role.

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The term space charge is applied to the cloud of electrons that is formed in the interelectrode space between cathode and plate. Since it is made up of electrons, this cloud constitutes a negative charge in the interelectrode space that has a repelling effect on the electrons being emitted from the cathode. The effect of this negative space charge alone, therefore, is to force a considerable portion of the emitted electrons back into the cathode and prevent others from reaching the plate.

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Plate current is the flow of electrons from cathode to the plate and their return to the cathode through the external circuit. Plate current flows in a diode when the plate is made positive with respect to the cathode. No current flows when the plate is negative with respect to the cathode. This is called unidirectional conduction.

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The cloud of electrons formed in the space between cathode and the plate is called space charge. The space charge is negative and hence has a repelling effect on electrons emitted from the cathode. The amount of the plate current depends on the space charge and the relative strength of the electric field set up by the positive plate voltage.