This IELTS diagram task 1 sample is about how a structure is used to generate power from waves.
An IELTS diagram is often much the same as an IELTS process. You should see a series of stages in the diagram and these should be explained in order, starting at the beginning.
In this example, the structures can be explained as well. You should make sure you mention everything. For example, the cliff and sea wall are also included in the response.
| You should spend about 20 minutes on this task. The diagrams below show a structure that is used to generate electricity from wave power. Summarise the information by selecting and reporting the main features and make comparisons where relevant. Write at least 150 words. |
Model Answer
The given illustrations present how electricity is generated using the power of the sea.
Overall, through a specially designed structure, a green source of electrical energy can be produced by the constant movement of the sea, which forces air through a chamber.
As seen in the first image, the man-made structure must be built next to a sea wall or cliff so that its foundation is strong enough to withstand the powerful waves. There is a specially constructed chamber, possibly built from a combination of metal and concrete, that allows seawater to flow in and out. The chamber leads into a column where a turbine is suspended. When a wave flows into the chamber, the water forcefully pushes the air out of the column. As the strong rush of air travels upwards, it pushes past the turbine, causing it to rotate quickly. It is this mechanical movement of the turbine that generates electricity.
As shown in the second picture, when the wave recedes, air refills the chamber, allowing the process to continue as the waves will keep entering and exiting the chamber, making the turbine spin continually. The result is a sustainable source of electrical energy.
(196 Words)
Evaluation of the question
Task Achievement: Band 7.5
The response provides a clear and accurate description of how electricity is generated using wave power. It effectively outlines the main steps and processes, ensuring the key features are highlighted. However, it could offer more detail on the mechanics of the turbine and the role of air pressure. While the explanation is clear, some additional details on the functionality of the system might enhance the response.
Coherence and Cohesion: Band 8
The report follows a logical structure, beginning with a general overview, followed by a detailed description of the wave power system. The explanation of the process flows smoothly from one step to the next, with appropriate use of linking words such as “when,” “as,” and “as shown.” Cohesion is strong, and there are clear transitions between sentences and paragraphs, contributing to the overall clarity of the description.
Lexical Resource: Band 7.5
The vocabulary used is varied and appropriate for the task, with phrases such as “man-made structure,” “forcefully pushes,” and “sustainable source of energy.” While the word choice is generally effective, there could be more variation in certain phrases (e.g., “air travels upwards,” “pushes past the turbine”). Overall, the range of vocabulary is sufficient but could be expanded further.
Grammatical Range and Accuracy: Band 8
The grammatical structures are varied and accurate, with a mix of complex and compound sentences. There are no major errors, and the explanation is clear and easy to understand. The report uses passive and active voice appropriately, contributing to the description’s precision. Some sentences could be slightly more concise, but overall, the grammar is strong and error-free.
Overall Band: 7.5
The response provides a solid and clear explanation of the wave power generation process. To improve the score, it could offer more technical details about how air pressure drives the turbine and include more varied vocabulary to reduce repetition. However, it remains well-structured and grammatically accurate.
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