5. Use the model to match the notions and their definitions.

Model. electricity is known to be / is defined as / is referred to as / stands for / is called the flow / current of free electrons.

1) electric current, conductance, resistance, electromotive force, volt, potential difference, voltage, transformer.

2) difference between two points defined as the work per unit charge done by the charges in moving from one point to the other; a unit of measuring electromotive force and electric potential; force of the electric current; the property of a substance to carry out electricity; the device by which A. C. voltage is changed; a flow of free electrons through a conductor; the property of an elec­tric circuit to convert power from electrical form to heat; the work per unit charge done by the battery.

6. Match the derivatives and use them in definitions.

1) electric – electrician – electricity – electron, generate – generator – generate, conduct – conductor – conductance – conductivity, resist – resistor – resistance – resistivity – resistant, to measure – measure – measurement – measurable.

2) електрика – електрон – електричний – електрик, напруга, провідник – провідність – проводити, опір – опиратися – опірність – опірний – питомий опір – котушка (елемент опору), вимір – вимірюваний – вимірювати – міра.

7. Group the synonyms and use them in discussion on the topic.

power, details, voltage, alter, elements, measure, continious, carry, job, tention, engagement, force, convert, work, check, transform, essential, occupation, basic, conduct, principal, parts, constant, energy, components, vary, change.

8. Desipher and translate the abbreviations.

D.C., A.C., e.m.f., h.p., lb, s.w., r.p.s., yd, sc., p.s.i.

9. Use the models to transform the sentences into the Subjunctive Mood.

Model 1. The Common Aspect. I suggest, demand, require order, suppose, insist, that we should gather after classes.

Model 2. The Common Aspect. Should you meet him tomorrow, tell him to come.

Model 3. The Perfect Aspect. It is impossible that you should have thought so before we met.

Model 4. The Continious Aspect. He should be speaking tomorrow.

Model 5. The Perfect Continious Aspect. He should have been

speaking yesterday.

1. To work with electricity you must take care not to touch a bare wire. 2. It is necessary to measure voltage. 3. They suggest the students to make the electric cirquit. 4. We are adviced to cut off electricity not to have electric shock. 5. All people are ordered to economize elecrticity. 6. It is required to pay for electricity in time. 7. They were warned not to touch the cables in order not to be killed 8. If you happen to repair you elecric iron, mind the insulation. 9. When the main source of energy is going to be the sun we will be able to breathe with fresh air. 10. If he, by chance, worked at the power plant, he would know its scheme well.