V. Translate
Существует два типа механической энергии - потенциальная энергия и кинетическая энергия. …………………………...…………………………………...
Потенциальная энергия называется гравитационной потенциальной энергией, так как объект преодолевает гравитационное поле Земли. ………………………………………………………………………………………………………………………………
Если вода подается из большого резервуара в небольшой водоем в горах, она приобретает потенциальную энергию…………………………………………………………………………
Когда автомобиль движется, ему сообщается энергия движения или кинетическая энергия………………………………………………………..…
……………………………………………………………………………………
Бензин сгорает в двигателе и сообщает автомобилю кинетическую энергию…..……………………………………………………………………...
Когда водитель тормозит, кинетическая энергия автомобиля уменьшается.……………………………………………………………………
Если твердое тело, жидкость или газ движется, то это вещество обладает кинетической энергией. ……………………………………………
……………………………………………………………………………………
VI. Speak
1
.
Interview
Work in pairs and prepare an interview
Student A is a going to make a report on types of mechanical energy
Student B a physicist who knows mechanical energy.
2. Prepare a report on the types of mechanical energy
UNIT
7
Tidal energy
Preview
Answer the questions. Then talk about your answers.
1) Do you know what tidal energy is? 2) Where is this type of energy used? 3) Can tidal energy be used in the Altai region?
|
I. Listening and reading
Listen to the text
Read and translate the text
Tidal energy
T
idal
energy
is energy that can be obtained
from
the changing sea levels. In other words, tidal energy is a direct
result
of tide shifting
from
low to high.
Tidal energy is considered a renewable source of energy. It only uses the energy from tide changes instead of burning or consuming any form of energy source. It is also considered inexhaustible because tides always rise and fall due to gravity.
Tidal power utilization is also considered a very reliable source of energy due to its predictability. Compared to other energy sources such as wind or solar energy, tidal changes are easier to predict. They also occur consistently. Unlike solar or wind energy tidal energy does not depend on the season or the weather type. Instead, tidal energy relies purely on the orbital kinetic energy that the sun exerts as the earth orbits around it. The same goes for the moon and earth orbital system. As the moon orbits around the earth, both sides experience a gravitational force.
Consequently, all of the forces that work within the orbital systems create an imbalance in the earth's water levels. So, some places have high water levels while others have decreased water levels.
The largest tidal power station in the world and the only one in Europe is in northern France. It was built in 1966.
Advantages of tidal energy
Once you've built a tidal power station, tidal power is free.
It produces no greenhouse gases or other waste.
It needs no fuel.
It produces electricity reliably.
It is not expensive to maintain.
Tides are totally predictable.
Disadvantages of tidal energy
Only provides power for around 10 hours each day, when the tide is actually moving in or out.
There are few suitable sites for tidal barrages.