## Unit of electrical current and current measurement

### I. Read and learn the following words.

an extremely small unit – надзвичайно мала одиниця
a convenient unit – зручна одиниця
the measurement – вимірювання
electric current – електричний струм
in a circuit – в ланцюгу
detect – виявляти
is based upon – базується на
as electrolytic dissociation – електролітична дисоціація
liquid – рідина
to maintain – підтримувати
copper plates – мідні пластини
a solution – розчин
supply electric energy- постачати електричну енергію
pass through – проходити крізь
the bulb - лампочка
the voltage - напруга

### II. Read and translate the text.

The electron is an extremely small unit, and for thus reason it is not a convenient unit to use in the measurement of electric current or of quantity of electricity. The presence of an electric current in a circuit may be detected and its strength may be measured by a number of different methods. Each method is based upon some effect which the current produces under given conditions.

One of these effects is known as electrolytic dissociation. The properties of most conducting liquids are such that when a direct current is maintained in them, the constituent elements of the liquid are separated. For example, when two copper plates are dipped in a solution of copper sulphate and a direct current is maintained in a liquid entering at one plate, the anode, and leaving at the other, the cathode, metallic copper leaves the solution and is deposited on the cathode.

Electric Cells. An electric cell is used to produce and supply electric energy. It consists of an electrolyte and two electrodes. Electrodes are used as terminals, they connect the cell to the circuit – current passes through the terminals and the bulb lights. Cells can be connected in series, in parallel and in series-parallel. In order to increase the current capacity cells should be connected in parallel. In order to increase the voltage output cells should be connected in series.

### III. Answer the following questions.

1. What is an electron?
2. Is electron a convenient unit?
3. May the presence of an electric current be detected in a circuit?
4. How can its strength be measured?
5. What is the electrolytic dissociation?
6. What are the properties of the most conducting liquids?
7. Where is an electric cell used?
8. What does an electric cell consist of?
9. How electrodes are used?
10. How cells can be connected?
11. How cells should be connected in order to increase the voltage?

### IV. Translate the following word-combinations from English into Ukrainian.

To increase the voltage, an electric cell, current passes through the terminals, connected in series, the bulb lights, in parallel, in series-parallel, different methods, an extremely small unit, they connect the cell to the circuit, a number of different methods, the cathode, most conducting liquids, the constituent elements, the current capacity, under given conditions.

### V. Build sentences using the following words.

The measurement, the current, quantity of electricity, electric current, electrolytic dissociation, metallic, electrode, cell, terminal, the bulb, to connect, the voltage, the solution, to maintain.