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The diagrams below show the design for a wave-energy machine and its location.

The diagrams below show the design for a wave-energy machine and its location. bY2lQ
The two diagrams illustrate the process of generating energy from waves through a machine and its alternative installation locations. Overall, the wave-energy machine is constituted of two chambers, two turbines, and an electricity generator. The water pressure of the waves and airflow make this device function. For the location options, there are two possible positions for the installation which are either near the shore or offshore. The machine is oriented in a way that follows the wave direction. As the wave enters the lower chamber, resulting in the rise of the water level. This forces the air inside the lower chamber to flow upward, generating a rotational movement of the turbines and then going outside through a wide opening above. After that, the air flows into the upper chamber through a porous opening on top as the water leaves the lower chamber, which also creates another rotational movement. The turbine rotation is used for generating electricity by a generator connected to the turbines. Regarding the alternative positions for installation of the machine, there will be high output as placing the machine offshore because of large waves; however, it requires expensive installation costs. The expenditure of installation is lower if the machine is situated near the shore. A lower output would be expected.
The two diagrams illustrate the process of generating energy from
You use this word too often, consider replacing it with
waves
through a
You use this word too often, consider replacing it with
machine
and its alternative installation locations.

Overall
, the wave-energy
You use this word too often, consider replacing it with
machine
is constituted
of two
You use this word too often, consider replacing it with
chambers
, two turbines, and an electricity generator. The water pressure of the
You use this word too often, consider replacing it with
waves
and airflow
This phrase/word (depending on the context) can be potentially replaced with :
make
this device function. For the location options, there are two possible positions for the installation which are either near the shore or offshore.

The
You use this word too often, consider replacing it with
machine
is oriented
in a way that follows the
You use this word too often, consider replacing it with
wave
direction. As the
You use this word too often, consider replacing it with
wave
enters the lower
You use this word too often, consider replacing it with
chamber
, resulting in the rise of the water level. This forces the air inside the lower
You use this word too often, consider replacing it with
chamber
to flow upward, generating a rotational movement of the turbines and then going outside through a wide opening above. After that, the air flows into the upper
You use this word too often, consider replacing it with
chamber
through a porous opening on top as the water
This phrase/word (depending on the context) can be potentially replaced with :
leaves
the lower
You use this word too often, consider replacing it with
chamber
, which
also
creates another rotational movement. The turbine rotation is
This phrase/word (depending on the context) can be potentially replaced with :
used
for generating electricity by a generator connected to the turbines.

Regarding the alternative positions for installation of the
You use this word too often, consider replacing it with
machine
, there will be high output as placing the
You use this word too often, consider replacing it with
machine
offshore
This phrase/word is too simple and can be replaced with:
because
of large
You use this word too often, consider replacing it with
waves
;
however
, it requires expensive installation costs. The expenditure of installation is lower if the
You use this word too often, consider replacing it with
machine
is situated
near the shore. A lower output would be
This phrase/word (depending on the context) can be potentially replaced with :
expected
.
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IELTS academic The diagrams below show the design for a wave-energy machine and its location.

Academic
  American English
4 paragraphs
212 words
6.5
Overall Band Score
Coherence and Cohesion: 7.0
  • Structure your answers in logical paragraphs
  • ?
    One main idea per paragraph
  • ?
    Include an introduction and conclusion
  • ?
    Support main points with an explanation and then an example
  • Use cohesive linking words accurately and appropriately
  • ?
    Vary your linking phrases using synonyms
Lexical Resource: 5.5
  • Try to vary your vocabulary using accurate synonyms
  • Use less common question specific words that accurately convey meaning
  • Check your work for spelling and word formation mistakes
Grammatical Range: 6.5
  • Use a variety of complex and simple sentences
  • Check your writing for errors
Task Achievement: 7.0
  • Answer all parts of the question
  • ?
    Present relevant ideas
  • Fully explain these ideas
  • ?
    Support ideas with relevant, specific examples
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