and the National Grid
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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|---|---|---|---|---|---|
| what is the National Grid? | is the network of pylons and cables that cover Britain, getting electricity to homes everywhere. it takes electrical energy from power stations to where its needed in homes and industry
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| how do you transmit the huge amount of power needed? | you need either a high voltage or a high current
🗑
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| what is the problem with a high current? | you lose loads of energy through heat cables. its much cheaper to boost the voltage up really high (400 000 v)and keep the the current very low
🗑
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| how do you get the voltage to 400 000 v? | it requires transformers and big pylons with huge insulators
🗑
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| what do the transformers do? | they have to step the voltage up (step up)at one end for efficient transmission and then bring it back down to safe levels at the other end (step-down)
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| how is the voltage increased? | using a step up transformer
🗑
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| how is the voltage reduced? | using a step down transformer
🗑
|
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| what are the advantages of overhead cables? | - lower setup costs
- easy to access
- easy to setup
- minimal disturbance to land
🗑
|
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| what are the disadvantage of overhead cables? | - lots of maintenance needed
- ugly
- affected by the weather
- less reliable
🗑
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| what are the advantages of underground cables? | - minimal maintenance
- hidden
- not affected by weather
- more reliable
🗑
|
||||
| what are the disadvantages of underground cables? | - higher set up cost
- hard to access
- hard to set up
- lots of disturbance to land
🗑
|
||||
| what is the National Grid? | is the network of pylons and cables that cover Britain, getting electricity to homes everywhere. it takes electrical energy from power stations to where its needed in homes and industry
🗑
|
||||
| how do you transmit the huge amount of power needed? | you need either a high voltage or a high current
🗑
|
||||
| what is the problem with a high current? | you lose loads of energy through heat cables. its much cheaper to boost the voltage up really high (400 000 v)and keep the the current very low
🗑
|
||||
| how do you get the voltage to 400 000 v? | it requires transformers and big pylons with huge insulators
🗑
|
||||
| what do the transformers do? | they have to step the voltage up (step up)at one end for efficient transmission and then bring it back down to safe levels at the other end (step-down)
🗑
|
||||
| how is the voltage increased? | using a step up transformer
🗑
|
||||
| how is the voltage reduced? | using a step down transformer
🗑
|
||||
| what are the advantages of overhead cables? | - lower setup costs
- easy to access
- easy to setup
- minimal disturbance to land
🗑
|
||||
| what are the disadvantage of overhead cables? | - lots of maintenance needed
- ugly
- affected by the weather
- less reliable
🗑
|
||||
| what are the advantages of underground cables? | - minimal maintenance
- hidden
- not affected by weather
- more reliable
🗑
|
||||
| what are the disadvantages of underground cables? | - higher set up cost
- hard to access
- hard to set up
- lots of disturbance to land
🗑
|
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