The diagrams show a structure that is used to generate electricity from wave power.
Sample Response
The charts illustrate how electricity is produced from the sea tide and ebb using a structure near the seashore. This edifice is a man-made tool which produces electricity, thanks to the movement of the sea waves. As can be seen, the process begins with the arrival of the wave and it finishes when ebb happens. As the first diagram suggests, sea waves enter inside the chamber of the structure during the tide and then the force of the wave permits a powerful movement of the air inside a column in which a turbine is collocated. Thanks to the activity of the air, the turbine starts to rotate faster and this rotation is used to generate electricity. Looking further in the second diagram, the turbine produces electricity even when the waves move away from the shore during the ebb. In fact, when the wave turns back, it creates an inverse movement of the air which permits the movement of the turbine which is the source of power for generating electricity.
IELTS Writing Correction
- 1. Name the visuals Original: charts Suggested revision: diagrams Why it matters: The visuals are process diagrams rather than charts.
- 2. Describe wave phases Original: sea tide and ebb Suggested revision: incoming and outgoing waves Why it matters: The diagrams show wave movement toward and away from shore, not a tidal cycle.
- 3. Use technical noun Original: edifice Suggested revision: structure Why it matters: Structure is clearer and more appropriate for the illustrated device.
- 4. Describe the system Original: tool Suggested revision: system Why it matters: The installation is a system with a chamber, column, and turbine rather than a single tool.
- 5. Use correct article Original: the Suggested revision: a Why it matters: A singular countable wave requires an indefinite article on first reference.
- 6. Show continuous cycle Original: it finishes when ebb happens Suggested revision: continues as the wave recedes Why it matters: Electricity generation continues during the outgoing phase rather than finishing.
- 7. Remove redundant preposition Original: enter inside Suggested revision: enter Why it matters: Enter already means move inside.
- 8. Describe airflow accurately Original: the force of the wave permits a powerful movement of the air Suggested revision: the incoming wave forces air upward Why it matters: This directly describes the direction and cause shown in the first diagram.
- 9. Correct word choice Original: collocated Suggested revision: located Why it matters: Collocated does not mean physically positioned in this context.
- 10. Use process language Original: Thanks to the activity of the air Suggested revision: Driven by this airflow Why it matters: This gives a more precise mechanical link between the air and turbine.
- 11. Avoid unsupported speed Original: starts to rotate faster Suggested revision: rotates Why it matters: The diagram shows rotation but provides no information about increasing speed.
- 12. Use direct transition Original: Looking further in the second diagram Suggested revision: In the second diagram Why it matters: The shorter transition clearly introduces the outgoing-wave stage.
Suggested Rewrites
- charts diagrams
- sea tide and ebb incoming and outgoing waves
- edifice structure
- tool system
- the a
- it finishes when ebb happens continues as the wave recedes
Why this response received Band 7.0
The response clearly explains how incoming and receding waves move air through the column and drive the turbine, and its sequence is easy to follow. The main content gap is that it never states the turbine turns in the same direction during both phases, while some wording is unnecessarily awkward or repetitive. Prioritise an explicit two-phase overview that highlights this shared turbine direction, then describe each airflow path with more precise technical language.
IELTS Writing Criteria Scores
Task Achievement
The response accurately covers both wave phases and the air-driven generation process, but omits the important fact that the turbine rotates in the same direction throughout.
Make the overview explicit that incoming and outgoing waves reverse the airflow while the turbine continues turning in the same direction to generate electricity.
Coherence and Cohesion
The process is presented in a clear chronological sequence, although the single paragraph and some repetitive linking make the organisation less polished.
Separate the overview from the two process stages and use concise stage links that emphasise the contrast between rising and falling water.
Lexical Resource
A sufficient range of process vocabulary conveys the mechanism clearly, but choices such as 'edifice', 'collocated' and repeated forms of 'movement' sound imprecise.
Use exact diagram terms such as 'chamber', 'airflow', 'column' and 'turbine' consistently, replacing unusual or repetitive wording.
Grammatical Range and Accuracy
The response demonstrates a good range of complex structures with generally clear control, despite occasional awkward constructions and unnecessary relative-clause chaining.
Refine the longest sentences by reducing repeated relative clauses and using direct passive forms to describe each mechanical stage.
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IELTS Academic Writing Task 1
The diagrams show a structure that is used to generate electricity from wave power.
Your response
Write the task yourself, then compare your choices with the annotated response.