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cathode, while oxidation occurs to anions at the anode. The electrodes do not
touch one another but are electrically connected by the electrolyte.
4.
Batteries are classified into primary and secondary forms:
5.
Primary batteries are designed to be used until exhausted of energy then
discarded. Their chemical reactions are generally not reversible, so they cannot
be recharged. When the supply of reactants in the battery is exhausted, the
battery stops producing current and is useless. However, not all disposable
batteries are the same. The components of a battery's electrochemical cells play
a significant role in its performance and applications. Zinc-carbon batteries are
the most common type, thanks to their low cost and reliable performance. In
comparison, batteries like alkaline batteries and mercuric-oxide batteries serve a
more niche part.
6.
Secondary batteries can be recharged, they can have their chemical
reactions reversed by applying
to the cell. This regenerates the
original chemical reactants, so they can be used, recharged, and used again
multiple times. After a rechargeable battery exhausts its electrochemical energy,
an external electric current can reverse the chemicals back into their original
state, ready to repeat the cycle of electricity production all over again.
Read the text again and circle any words and phrases you don’t
know. Write out the unknown words/phrases. Without using a dictionary,
try to guess their meaning. Compare your ideas with your groupmates
New words/phrases
I think it means….
Look through the text. What words are formed with suffixes and
prefixes? Underline 10 examples of word formation. Decide on the part of
speech for each of the word
Look through the text again and find
A.
the paragraph describing types of the battery;
B.
the paragraph that talks about the role of electrolyte;
C.
the paragraph describing the process taking place inside the
rechargeable battery;
D.
the paragraph indicating the definition of a battery;
E.
the paragraph giving the construction of the battery;
F.
the paragraph describing a battery which cab ne used once.
Make up an outline of the text
