Electric currents and their properties. Контрольная работа № 1 по дисциплине «Технический иностранный язык»

Контрольная работа № 1

по дисциплине «Технический иностранный язык»

для студентов заочной формы обучения

1. Прочитайте и письменнопереведите текст.

Electric currents and their properties

Conduction is the name normally given to a movement or flow of charges. The charges are usually electrons, but may also be ions when the conduction takes place in gaseous or liquid conductors, in which the ions are mobile.

How does the current flow through a wire? A metal is made up of tiny crystals which are visible under a microscope. A crystal is a regular and orderly arrangement of atoms. As it was explained, an atom is a complex particle in which tiny electrons move around nucleus. When the atoms are tightly packed as they are in a metallic solid, some of the electrons move freely between the atoms. These are called free electrons. Ordinarily, the free electrons move at random through the metal. There must be some driving force to cause the electrons to move through the metal conductor. This driving force tending to produce the motion of electrons through a circuit is called an electromotive force or e.m.f. that moves electric charges from one point in the circuit to another.

1. Ответьте на вопросы.

1. What is conduction?

2. What is a metal made up of?

3. What are free electrons?

4. What makes the electrons to move through the metal conductor?

5. What is an electromotive force?

6. What kinds of current can you name?