Electric Cells

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Mr. Ford said: "I dont like pork. " (М-р Форд сказал: "Я не люблю свинину. ")
Little Tim told his mother: "I am sleepy. " (Маленький Тим сказал маме: "Я хочу спать. ")
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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. In case a battery has a large current capacity and a large voltage output, its cells are connected in series-parallel.
When cells are connected in series the positive terminal of one cell is connected to the negative terminal of the second cell, the positive terminal of the second cell-to the negative terminal of the third . . . and so on.
When cells are connected in parallel their negative terminals arc connected together and their positive terminals are also connected.
In case a cell has a trouble it stops operating or operates badly. This cell should be substituted by another one.
EXERCISES
A
Find the correct variant. Remember it:
1. a cell is used
a) to increase the voltage output
b) to reduce the current capacity
c) to supply electric energy
2. the terminals of a cell are used
a) to conduct current
b) to increase voltage
c) to connect the battery to a circuit
3. when cells are connected in series
a) all the positive