Phrasal verbs

15. Put one of the following phrasal verbs in its correct form into each gap:

1. You should be a qualified specialist to ____ this work. 2. In order to ____ or ____ an electric light, we generally use a switch. 3. If one bulb breaks in a series circuit, all the lights ____. 4. If too much electricity flows, the fuse ____ and quickly melts. 5. The static electricity is made when you ____ your dry hair with a plastic comb. 6. Chemicals in the body ____ our food into useful substances. 7. Coal, oil, and gas can ____within 100 years or so.
8. Our University ____ academician Petro Vasylenko who devoted all his life to agricultural engineering science. 9. In a parallel circuit, the total electric current ____ among the different branches of the circuit. 10. If two quantities are indirectly proportional, it means that if one quantity ____ the other ____.

16. Translate these sentences paying special attention to modal verbs.

1. A magnetic field can pass through materials like air, water, paper, and glass. 2. Scientists think pigeons and bees are able to use the Earth’s magnetism to help them find their way. 3. A material that can be attracted by a magnet is called magnetic.
4. Electromagnets can be switched on and off. 5. Because it is difficult to store electricity, large quantities of it must be made as it is needed. 6. There has to be a potential difference to force the current to flow. 7. I ought to visit my parents more often. 8. May I smoke in the laboratory? 9. Only trained people were allowed to use this equipment. 10. Only students with the correct licences will be allowed to drive a vehicle. 11. We were to start work at 6. 12. You must come and see us.

17. Revise the infinitive functions and translate the sentences given below.

1. To carry electric charges by means of ions is the property of electrolytes. 2. To discover the electron was very important for electrostatics. 3. To conduct electric charges is the property of conductors 4. To obtain a larger electromotive force in a circuit, and hence to increase the current, cells can be arranged in series. 5. The heating effect of an electric current is used in fuses to safeguard circuits against excessive heating. 6. An ammeter must always be placed in a circuit so that the current to be measured flows directly through it.