Put down the corresponding nouns. Form nouns from these adjectives and translate them into Russian.

Read the words and put down their Russian equivalents. Then translate them back into English (orally).

1. atmosphere – атмосфера

2. personnel – персонал, личный состав

3. contact – контакт, связь, понимание

4. regular – стандартный, регулярный

5. control – руководство, управление, контроль

6. detect – раскрывать, обнаруживать

Put down the corresponding nouns. form nouns from these adjectives and translate them into Russian.

Strong	Strength - сила
Long	Length - длина
Broad	Breadth - ширина
High	Height - высота

4. Put down the Russian for:

Under voltage – пониженное напряжение

Under 20 V – под 20 В

Over 30 V – более 30 В

The power is on – питание включено

The power is off – питание отключено

Great strength – мощная сила

Dry air - сухой воздух

Dead conductor – хороший проводник

Live conductors – провод под напряжением

5. Choose the suitable words and translate the sentences:

1. The danger of electric shock disappears when the conductor becomes dead. Опасность ударится током исчезает, когда проводник заземлен.

2. Current passes through faulty unearthed part of installations when the power is on. Ток проходит через неисправные части установки когда питание включено.

3. Low accuracy of measurement is a disadvantage of the measuring device. Низкая точность измерения является недостатком измерительного прибора.

4. The danger of electric shock increases in the wet and hot atmosphere. Опасность поражения электрическим током увеличивается в теплой и влажной атмосфере.

5. No current flows through a dead conductor. Ток не проходит через поврежденный проводник.

6. Fill in using the verbsto detect, to appear, to disappear, to decrease:

1. When resistance increases, the risk of electric shock decrease.

2. Faults in electric installations are detect by means of special devices.

3. Electric power appear only on live conductors with power on.

4. When the device is switched off electric power disappears.

7. Complete the sentences using the correct variant:

1. Earthing system serves a) as protection from an electric shock.

b) as connection with ground.

2. Voltage appears on a) dead parts.

b) live parts.

3. Contact with live conductors is a) dangerous.

b) safe.

4. Connection to ground is made a) by means of wire conductors.

b) by means of earthing electrodes.

5. Danger of an electric shock a) is earthed,
disappears if the frame b) is unearthed.

9. Answer these questions:

1. What does an earthing system serve for? - Earthing system serves to protect attending personnel from electric shocks when voltage appears on parts that are normally dead.

2. What parts are termed dead (live)? - When the power is on, contacts with live conductors are dangerous for life.

3. In what air does the risk of an electric shock decrease? - The risk of an electric shock decreases with decreasing voltage.

4. By what means is connection to ground made? - The danger of an electric shock disappears provided the metal parts of installations under voltage are connected with ground by means of safety earthing.

5. What does an electric shock result from? - Thus, measures are taken to protect attending personnel from contacts with live parts of installations under voltage.

6. Is a current of 50 mA dangerous for a man? - A current of 50 mA is dangerous for a man.

7. Is wet and hot atmosphere dangerous for the attending personnel? - In wet and hot atmosphere the risk of electric shock increases.

8. Does the risk of an electric shock decrease with increasing current? - A current of 100 mA and higher is lethal.

10. Read the text and write four questions about it. Ask your groupmates to answer them.

1. When a person may get an electric shock? - A man can get an electric shock when he comes into contact with the electric fish.

2. What kind is found in the tropical waters of South America? - One of this kind is found in the tropical waters of South America: it is the electric eel.

3. What fish can generate 600 volts? - A very big fish can generate 600 volts!

4. How and what part of the charge from the eel? - The eel's head is positively charged and the opposite end is negatively charged.