(national grid) electricity at home
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10 Terms
what is the national grid?
a collection of pylons and power cables that connect power stations to our homes
what are the steps for electricity to our homes?
power station
step-up transformer
pylons
step down transformer
to our home
what does the step-up transformer do?
it increases the voltage
how much voltage is in the pylons?
400,000v
what do the step down transformer do?
decreases the current to 11000v
were does it go from the step down transformer?
to our homes
what is the voltage of the mains suply
230v
50hz
true or false is the uk mains suply alternating current?
TRUE
what are the colours for the three core cables lable
brown-live
blue-neutral
green/yellow-earth
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
Note 
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