National Grid

Question 1

What are the pros of having underground of powerstations?

Answer 1

• not affected by weather

- doesn’t make an area look ugly

Question 2

What are the cons of having underground powerstations?

Answer 2

• affects nature

- expensive to dig up if any needs to be repaired

Question 3

The pros of overhead powerstations

Answer 3

• easier to repair

- cheaper

Question 4

The cons of overhead powerstations

Answer 4

• Weather can affect it e.g. lightning

- takes up valuable space

Question 5

What is the national grid?

Answer 5

A network of pylons and cables that connects powerstations to our homes.

Question 6

Name the stages of how you get electricity to your house from a PS

Answer 6

Powerstation ➡️step up transformer ➡️pylons ➡️step down transformer ➡️houses

Question 7

What does the step up transformer do?

Answer 7

• increases voltage
• decrease current
• less heat is lost

Question 8

What does the step down transformer do?

Answer 8

• decrease voltage

Question 9

how many volts go through the pylons?

Answer 9

400,000V

Question 10

how many volts does the Ps to Step up have?

Answer 10

25,000V

Question 11

how many volts does the step down t have?

Answer 11

23V

Question 12

What effect does the wasted energy have on the surrounding area?

Answer 12

Makes the air hotter.

Question 13

what will making the current in the cables smaller do?

Answer 13

It will reduce the energy lost in the cables.