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Fill in the gaps with the words from the box
batteries cells chemical discharged disposable ecology
environmental once pollution reaction rechargeable
recharged recycled reversible source use up wearing out widespread
A battery is a DC voltage _______________ and consists of one or more
_______________ which convert _______________ energy into electric
energy. There are two types of _______________. These are primary or
________________ and secondary or _______________. Primary batteries can
only be used ________________ because they ________________ their
chemicals in an irreversible _______________. Secondary batteries can be
________________ because the chemical reactions they use are
_________________; they are recharged by running a charging current through
a battery. Secondary batteries are called rechargeable because they can be
charged and _______________ many times before wearing out. The
________________ use of batteries has created many _______________
problems, such as toxic metal _________________. But, when
________________ is concerned, it is important that after _______________
some batteries can be ________________.
TEXT A
Read the information on batteries and give the main idea of the text
1.
An electric battery can be defined as a device that makes use of either one
or an assembly of electrochemical cells that convert the stored chemical energy
within them into electrical energy.
2.
A battery is an energy source consisting of two electrodes. Both are of
made conductive materials, but they serve different roles. One electrode, known
as the cathode, connects to the positive end of the battery and is where the
electrical current leaves (or electrons enter) the battery during discharge, which
is when the battery is being used to power something. The other electrode,
known as the anode, connects to the negative end of the battery and is where the
electrical current enters (or electrons leave) the battery during discharge.
3.
Between these electrodes, as well as inside them, is the electrolyte. This
liquid or gel-like substance contains electrically charged particles, or ions. The
ions combine with the materials that make up the electrodes, producing
chemical reactions that allow a battery to generate an electric current. In the
redox reaction that powers the battery, reduction occurs to cations at the
