TRANSFORMERS AND NATIONAL GRIDS
1 mark · EasyExplain why power lines of the National Grid are placed high above the ground.
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Because the transmission voltage is very high, and this reduces the risk of electric shock to people.
Also accept: To prevent accidental contact with high voltage lines; To protect people from danger of shock
Common mistakes: Saying it is to keep birds away
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Marking points
B1 · 1 mark · Explains that the high voltage means safety is needed: power lines are raised to prevent dangerous contact.
Worked solution
The wires are placed high above the ground to keep people and animals away from dangerous high voltages.