1. Complete the text with correct words.

POWER GRID

The power grid begins with electricity 1. in power 2. , where alternating current (AC) is generated. Next, the power grid carries out electricity transmission through 3. . However, electrical resistance causes power 4. over long distances. To minimize this problem, the 5. is increased using 6. transformers located in 7. . Transmission also takes place on tall towers or 8. , as well as underground.
Finally, during the power grid distribution phase, there is a need to lower 9. to safe levels for end-users. Electricity is delivered to homes at 120-10. volts, while industrial plants require higher energy levels, operating at 10 to 30 11. . This voltage reduction is achieved by 12. transformers in substations.

2.1 Watch the video and answer the question: how long are the mentioned transmission lines? aperta

2.2 After watching the video in the previous exercise, answer the question: what types of power sources are connected to the distribution systems? aperta

2.3 After watching the video in the Exercise 2.1, answer the question: how is electricity mainly transmitted over the territory covered by the grid? aperta

2.4 After watching the video in the Exercise 2.1, answer the question: how many pylons does the grid have? aperta

2.5 After watching the video in the Exercise 2.1, answer the question: how are conductors isolated from the earth pylon? aperta

2.6 After watching the video in the Exercise 2.1, answer the question: what is the function of earth wires? aperta

2.7 After watching the video in the Exercise 2.1, answer the question: what is the “n minus one” principle? aperta

2.8 After watching the video in the Exercise 2.1, answer the question: what are the rules the company follows when building new lines? aperta

3. With the help of the picture, explain how a power grid works.

aperta