Process Diagram

Band 8+: The diagram below shows how electricity is generated in a hydroelectric power station. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

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Image for topic: The diagram below shows how electricity is generated in a hydroelectric power station. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

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The image depicts a diagram of a hydroelectric power station with labeled components, including a high-level reservoir, dam, intake (open during the day, closed at night), reversible turbines (operating the generator during the day, pumping water at night), power station with a generator, power lines connecting to the national grid, and a low-level reservoir. The arrows indicate the flow of water during the day and the flow of water or electricity during the night.

Given the complexity of the image, the above description may not be entirely accurate.

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The diagram illustrates how electricity is generated in a hydroelectric power station.

Overall, this is a reversible process that operates differently during the day and at night. During the day, electricity is generated as water flows from the high-level reservoir to the low-level reservoir. At night, the water is pumped back into the upper reservoir for reuse.

First, river water is stored in the high-level reservoir. During the day, the intake is opened, allowing water to flow towards the turbines. As the water passes through them, the turbines rotate and drive the generator. Electricity is then generated and transmitted to the national grid through power lines. After passing through the turbines, the water flows into the low-level reservoir.

At night, the intake is closed, and the reversible turbines operate as pumps. They pump water from the low-level reservoir back into the high-level reservoir, where it is stored until the following day. This allows the water to be reused to generate electricity.

Word Count: 161

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Overall Band Score

8.5

(+/- 0.5)

Vocabulary Complexity:
C1 - Intricate
Strive to incorporate even richer and more precise language.

Grammar Mistakes: N/A

Vocabulary Repetition:

water: 8

reservoir: 6

electricity: 4

turbines: 4

generated: 3

during: 3

night: 3

high-level: 3

low-level: 3

through: 3

Try using synonyms for the above words

Task Response

The report effectively addresses the task by clearly describing the main features of the hydroelectric power station and making relevant comparisons between the day and night operations. The structure is logical, with a clear overview and detailed explanation of the process. Minor omissions, such as not explicitly mentioning the role of the dam or the direction of electricity flow at night, are acceptable and do not detract from the overall quality. To improve, consider adding a brief mention of the dam's function and the fact that electricity is not generated at night, which would enhance completeness.

Coherence & Cohesion

The report is exceptionally well-organized and easy to follow. The introduction clearly paraphrases the task, and the overview effectively summarizes the main process. The body paragraphs are logically divided into day and night operations, with clear sequencing of steps. Cohesive devices are used naturally and appropriately, and paragraphing is skillfully managed.

Lexical Resource

The vocabulary is precise and varied, with appropriate use of technical terms such as 'reversible turbines,' 'intake,' 'high-level reservoir,' and 'national grid.' The language is natural and sophisticated, demonstrating full flexibility and control. There is no repetition or awkward phrasing. Pay attention to vocabulary repetition to improve the overall score.

Grammatical Range & Accuracy

The report demonstrates a wide range of grammatical structures used accurately and appropriately. Sentences are varied in length and complexity, with correct use of passive voice and conditional structures. Punctuation and grammar are flawless throughout, and the report meets the word count requirement.

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