(national grid) electricity at home

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10 Terms

1
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what is the national grid?

a collection of pylons and power cables that connect power stations to our homes

2
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what are the steps for electricity to our homes?

  1. power station

  2. step-up transformer

  3. pylons

  4. step down transformer

  5. to our home

3
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what does the step-up transformer do?

it increases the voltage

4
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how much voltage is in the pylons?

400,000v

5
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what do the step down transformer do?

decreases the current to 11000v

6
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were does it go from the step down transformer?

to our homes

7
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what is the voltage of the mains suply

230v

50hz

8
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true or false is the uk mains suply alternating current?

TRUE

9
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what are the colours for the three core cables lable

brown-live

blue-neutral

green/yellow-earth

10
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why is touching a live wire dangerous?

because your body is at 0v and the power suply is at 230v so when you touch it pd goes through your body and current flows through you