77
Look through the text again and find
A.
the paragraph which tells about the principle on which all power
stations operate;
B.the paragraph describing the difference between renewable and non-
renewable energy sources;
C.the paragraph describing the key limitation in the distribution of
electricity;
D.
the paragraph which tells why voltage has to be stepped up during
transmission;
E. the paragraph which tells where electric power is generated.
Make up an outline of the text
TEXT B
Describe the advantages and disadvantages of overhead power lines
and underground cables
Study the table below and check your ideas
Table 6
Content
Overhead Line
Underground Cable
Conductor
For
the
overhead
(transmission
and
distribution) lines, the bare
conductor is used.
For underground (transmission
and distribution) cable, the
insulated conductor is used.
Conductor
Size
The size of the conductor is
smaller as compared to the
conductor of the overhead
cables.
The size of the conductor is
large due to the coated
insulation.
Capacity
The overhead line has a
higher current carrying
capacity
than
the
underground cable.
The underground cable has a
lesser current carrying capacity
as compared to an overhead
line.
Capacity
It carries a high voltage
(near about the 400kV)
It carries a limited voltage
(not
more than 66kV).
