Hydroelectric plants harness energy by passing flowing water through a turbine. The water turbine rotation is delivered to a generator, which generates electricity. The quantity of electricity that can be produced at a hydroelectric plant relies upon two variables. These variables are (1) the vertical distance that the water falls, called the “head”, and (2) the flow rate, calculated as volume over time. The amount of electricity that is produced is thus proportional to the head product and the flow rate. Until only recently people believed almost universally that hydroelectric power was an environmentally safe and clean means of generating electricity. Hydroelectric stations do not release any of the usual atmospheric pollutants emitted by power plants fueled by fossil fuels so they do not add to global warming or acid rain. Nevertheless, recent studies of the larger reservoirs formed behind dams have implied that decomposing, flooded vegetation could give off greenhouse gases equal to those from other electricity sources.
Choose NO MORE THAN TWO WORDS from the passage for each answer.
Hydroelectric plants produce energy by passing
1
through a turbine.
Electricity is produced by delivering water
2
to a generator.
The amount of electricity that can be produced at a hydroelectric plant relies upon
3
and
4
.
Hydro electric power plants do not release any pollutants into the atmosphere, so they do not cause 5 .
Choose NO MORE THAN TWO WORDS from the passage to complete the sentences.
The taste is a more extreme experience than the smell, and this is because of the strong pleasure relationship between 6 and 6 .
It is universally acknowledged that
7
is the ultimate pleasurable sensation.
The famous French writer 8 is widely known for using this idea in his work.
The words sugar, honey, sweetie are used by lovers as terms of
9
.
Despite gaining attraction for its sugary taste, no one is sure what exactly makes a
10
sweet.