40
REVISION
Part I
Match each word with one of the definitions
1.
neuron
2.
charge
3.
molecule
4.
proton
5.
atom
6.
energy
7.
particle
8.
matter
9.
electron
10.
cell
a. a very small piece of matter, part of an atom;
b. the smallest unit, consisting of a group of atoms, into
which a substance can be divided without a change in its
chemical nature;
c. a very small piece of matter with a positive electric
charge that forms part of the nucleus of an atom;
d. physical substance in general that everything in the
world consists of;
e. a cell that carries information within the brain and
between the brain and other parts of the body;
f. the smallest part of a chemical element that can take part
in a chemical reaction;
g. the ability of matter or radiation to work because of its
mass, movement, electric charge, etc.;
h. the smallest unit of living matter that can exist on its
own;
i. a very small piece of matter with a negative electric
charge, found in all atoms;
j. the amount of electricity that is carried by a substance.
Complete the text with words formed from the words in capitals
(1)_____ is a property of any object or substance to
resist or oppose the flow of an (2)__________current. The
quantity of resistance in an electric circuit determines the
amount of current (3)___________in the circuit for any
(4)_________voltage applied to the circuit. The resistance
of an object is (5)___________by the nature of the
substance of which it is composed, known as the
(6)__________, the dimensions of the object, and the
(7)_________. The term resistance is also used when the
flow of a fluid or heat is impeded. The (8)______of
friction provide the resistance to the flow of a fluid in a
pipe, and (9)____provides (10)________resistance that
reduces the flow of heat from a higher to a lower
temperature.
RESIST
ELECTRIC
FLOW
GIVE
DETERMINE
RESIST
TEMPER
FORCE
INSULATE
THERM
