TRANSFORMERS AND NATIONAL GRIDS
1 mark · EasyState the main purpose of a step-up transformer in the National Grid.
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To increase the voltage (and reduce the current) for efficient transmission of electricity over long distances.
Also accept: To increase voltage for electricity transmission; To reduce energy loss by raising voltage
Common mistakes: Saying it increases current; Saying it is for safety
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Marking points
B1 · 1 mark · States that a step-up transformer increases voltage (or reduces current) for transmission.
Worked solution
A step-up transformer increases the voltage so that electricity can be transmitted efficiently over long distances.