Tidal Power
Technology is available to exploit the potential energy formed by tides for the generation of electrical energy. The basic structure is a barrage or dam built across a river estuary or at the mouth of a bay. This dam is similar to that used in hydroelectric power plants built across flowing rivers. At regular intervals along the dam, gates and turbines are installed. When the tide is rising, the gates are opened. This allows water to flow into the area behind the barrage, raising the water level there. When the water has reached its highest level, the gates are closed. Then the tide drops on the seaward side, and this trapped water is several meters above the sea level. The gates are then opened, allowing the water to discharge out. The force of the flow turns the turbines and generates electricity. It is also possible to use tidal energy when the water flows in the other direction - through the gates into the estuary from the sea.
In this way, four periods of energy production are possible every day, since coastal regions experience two high and two low tides in just over 24 hours. In order for practical amounts of electricity to be generated, the difference between high and low tides must be at least five meters. Tidal power is renewable, non-polluting, and contributes no greenhouse gases to the atmosphere. This kind of system can provide a useful energy supplement to other sources in an era of diminishing fossil fuel reserves.
According to the passage, the potential energy formed by tides for the generation of electrical energy can be exploited with the help of technology. However, the lecturer contradicts some of the points made in the passage and mentions some drawbacks of this tidal power, which are as under.
Firstly, the passage reports that tides are the great source of energy if it is used appropriately. But, the lecturer claims that tidal power cannot provide more than its limitation. Secondly, the passage mentions that for energy to be produced, a dam can be built across a river estuary. However, the speaker says that quality of water in that area will be changed which directly affects the local wildlife. Thirdly, the passage reports that it's possible to use tidal energy when the water flows in the other direction - through the gates into the estuary from the sea and it is non-polluting. In contrast, the speaker informs that salinity and mud levels increase and eventually affect the birds and fish of that region.
To conclude, the passage states how the tidal power can be beneficial to produce a higher amount of energy, while the lecturer points out drawbacks for the same.
| Post date | Users | Rates | Link to Content |
|---|---|---|---|
| 2017-07-09 | Aayushi | 73 | view |
| 2017-07-09 | akashdesai | 73 | view |
| 2016-12-27 | kantanandana | 73 | view |
| 2016-10-04 | nupur26796 | 60 | view |
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Grammar and spelling errors:
Line 1, column 184, Rule ID: SOME_OF_THE[1]
Message: Simply use 'some'.
Suggestion: some
...logy. However, the lecturer contradicts some of the points made in the passage and mentions...
^^^^^^^^^^^
Transition Words or Phrases used:
but, first, firstly, however, if, second, secondly, so, third, thirdly, while, in contrast
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 9.0 10.4613686534 86% => OK
Auxiliary verbs: 5.0 5.04856512141 99% => OK
Conjunction : 5.0 7.30242825607 68% => OK
Relative clauses : 11.0 12.0772626932 91% => OK
Pronoun: 13.0 22.412803532 58% => OK
Preposition: 25.0 30.3222958057 82% => OK
Nominalization: 3.0 5.01324503311 60% => More nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 987.0 1373.03311258 72% => OK
No of words: 198.0 270.72406181 73% => More content wanted.
Chars per words: 4.98484848485 5.08290768461 98% => OK
Fourth root words length: 3.75116612262 4.04702891845 93% => OK
Word Length SD: 2.56412420941 2.5805825403 99% => OK
Unique words: 112.0 145.348785872 77% => More unique words wanted.
Unique words percentage: 0.565656565657 0.540411800872 105% => OK
syllable_count: 311.4 419.366225166 74% => OK
avg_syllables_per_word: 1.6 1.55342163355 103% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 0.0 3.25607064018 0% => OK
Interrogative: 0.0 0.116997792494 0% => OK
Article: 10.0 8.23620309051 121% => OK
Subordination: 1.0 1.25165562914 80% => OK
Conjunction: 0.0 1.51434878587 0% => OK
Preposition: 3.0 2.5761589404 116% => OK
Performance on sentences:
How many sentences: 9.0 13.0662251656 69% => Need more sentences. Double check the format of sentences, make sure there is a space between two sentences, or have enough periods. And also check the lengths of sentences, maybe they are too long.
Sentence length: 22.0 21.2450331126 104% => OK
Sentence length SD: 30.6412938514 49.2860985944 62% => OK
Chars per sentence: 109.666666667 110.228320801 99% => OK
Words per sentence: 22.0 21.698381199 101% => OK
Discourse Markers: 10.0 7.06452816374 142% => OK
Paragraphs: 3.0 4.09492273731 73% => More paragraphs wanted.
Language errors: 1.0 4.19205298013 24% => OK
Sentences with positive sentiment : 6.0 4.33554083885 138% => OK
Sentences with negative sentiment : 2.0 4.45695364238 45% => More negative sentences wanted.
Sentences with neutral sentiment: 1.0 4.27373068433 23% => More facts, knowledge or examples wanted.
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.225597009142 0.272083759551 83% => OK
Sentence topic coherence: 0.0882279582849 0.0996497079465 89% => OK
Sentence topic coherence SD: 0.0829266874814 0.0662205650399 125% => OK
Paragraph topic coherence: 0.145654368242 0.162205337803 90% => OK
Paragraph topic coherence SD: 0.0597980395109 0.0443174109184 135% => OK
Essay readability:
automated_readability_index: 13.0 13.3589403974 97% => OK
flesch_reading_ease: 49.15 53.8541721854 91% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 11.9 11.0289183223 108% => OK
coleman_liau_index: 11.6 12.2367328918 95% => OK
dale_chall_readability_score: 8.87 8.42419426049 105% => OK
difficult_words: 52.0 63.6247240618 82% => More difficult words wanted.
linsear_write_formula: 8.0 10.7273730684 75% => OK
gunning_fog: 10.8 10.498013245 103% => OK
text_standard: 12.0 11.2008830022 107% => OK
What are above readability scores?
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Minimum four paragraphs wanted. The correct pattern:
para 1: introduction
para 2: doubt 1
para 3: doubt 2
para 4: doubt 3
Less contents wanted from the reading passages(25%), more content wanted from the lecture (75%).
Don't need a conclusion paragraph.
Read sample essays from ETS:
http://www.testbig.com/users/toeflwritingmaster
Rates: 73.3333333333 out of 100
Scores by essay e-grader: 22.0 Out of 30
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Note: the e-grader does NOT examine the meaning of words and ideas. VIP users will receive further evaluations by advanced module of e-grader and human graders.