Match these words to their definitions.

Give the Russian equivalents of the following expressions.

Outer electron orbit, a neutral zone, free electrons, electrostatic forces, a force of attraction, a force of repulsion, the random movement, an excess of electrons, a deficiency of electrons, an electromotive force, a flow of negative charges, a sample of fixed dimensions, cross-section.

5. Are the following sentences True or False?

1. In conductors, electrons in the outer orbits of the atoms move at random.

2. In conductors, we can consider the number of electrons moving in one direction equal to the number of electrons moving in the opposite direction.

3. There is a deficiency of electrons at the other end of a conductor and an excess at the other end.

4. The property of batteries or generators is to drive free electrons at random.

5. Electric current can flow easily in all substances.

6. Insulators include all metals and alloys, carbon and graphite.

7. Typical conductors are rubber, plastic, dry air, oil, glass and paper.

8. The resistance of different substances is the same.

Answer the questions.

1. What substances are called conductors?

2. What electrons are called free electrons?

3. What are two electrostatic forces?

4. In what case will the random movement continue?

5. What is the property of batteries or generators?

6. Is there a clear dividing line between conducting materials and insulating materials?

7. How can we compare the resistance of different substances?

8. What phenomenon is called resistivity?

Complete the following sentences.

1. There is no apparent movement of … .

2. The property of … or … is to make an electric current flow.

3. The electric current in a conductor is actually a flow of … … .

4. The substances in which the electrons move from atom to atom with difficulty are known as … .

5. There is no clear dividing line between … and … materials.

6. The resistance between opposite faces of the same cube is called … .

7. When a given … … is applied across the ends of the wire, an electric current always flows along it.