Assignment 11. Fill in the blanks with prepositions.

1) It is dangerous to go ... a stormy day.

2) Lightning is a very great flash ... light resulting ... a discharge ... atmospheric electricity.

3) Protecting buildings ... lightning was the first discovery ... the field ... electricity used ... the good ... mankind.

4) ... thousands ... years people knew nothing ... thunderstorms.

5) Lightning flashes are followed ... thunder which can be heard ... kilometres around.

6) There is always some danger ... a thunderstorm ... a very high building or a man standing ... the open field.

7) It is difficult to see a single drop ... water ... the sea.

8) Some scientists ... the past melted metals ... the help ... solar furnaces.

9) Modern civilization cannot do ... electrical appliances.

10) Electric current is necessary ... the operation ... trolley-buses, buses, and modern trains.

Assignment 12. Translate into Russian:

a) the only son; the only example known; the only method of solving the problem; only you can do it for me; coal is not only a source of heat, but also a source of valuable chemical substances; the letter was sent only yesterday;

b) many students were present; at the present time; the present article; he is in Moscow at present; that is all for the present; good-bye for the present,

Assignment 13. Form five sentences combining suitable parts of the sentences given in columns I and II.

I 1. The generator 2. The lightning conductor 3. The motor 4. The electric crane 5. The pyrometer

II 1) measures the temperature of hot melted metals. 2) lifts objects weighing thousands of tons. 3) turns electrical energy into mechanical energy. 4) protects buildings from lightning strokes. 5) converts mechanical energy into electrical energy.

Assignment 14. Describe Franklin’s kite experiment.

Assignment 15. Give a short summary of the text.

UNIT SIX

Assignment 1. Remember the following words and word-combinations:

electric current to observe relation to mention writing object to attract iron own staff to pull to hold (held) ability unfamiliar to possess passing to destroy part to fall out (fell) to pull out force application to consist of to point step forward physicist to put together to prove reference power weight minute to arrange direction disarrangement to divide to obtain to rub

электрический ток наблюдать связь, зависимость упоминать писание предмет; вещь притягивать железо собственный посох; жезл притягивать держать; удерживать способность незнакомый обладать, владеть проходящий разрушать часть выпадать вырывать; вытаскивать сила применение состоять из указывать шаг вперед физик соединять; собирать доказывать ссылка сила; мощность вес мелкий, мельчайший располагать(ся) направление расстройство; дезорганизация делить, разделять получать тереть, натирать

Assignment 2. Practice the pronunciation of the following words:

current, iron, own, to call, to pull, among, unfamiliar, discoverer, to possess, use, compass, north, south, scientific, well-known, physicist, various, to prove, earth, reference, astronomer, mathematician, achievement, also, material, to increase, power, to weigh, weight, quite, molecules, minute, to arrange, disorderly, to neutralize, process, magnetization, result, unmagnetized.

Assignment 3. Translate the words, their derivatives into Russian and learn them.

to achieve – achievement; to apply – application – appliance – applicable; to arrange – arrangement – disarrangement; to attract – attraction – attractable – attractive; to divide – divided – divider – division; to experiment – experiment – experimentation – experimenter – experimental; to increase – increase – increasingly; magnet – magnetic – magnetism – to magnetize – magnetization; to prove – proof – proven; physics – physicist – physical; to refer – reference– referable; to vary – variation – various – variable – variability; to weigh – weight – weightless – weightlessness.