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UK Mains Supply Values
The vending machine is connected to the mains electricity supply.
What is the frequency and the potential difference of the mains electricity supply in the UK?
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Marking points
- 1 Gives a frequency of 50 Hz.
- 2 Gives a potential difference of 230 V.
Full-mark answer
Frequency = 50 Hz; potential difference = 230 V.
Why this answer loses marks
I gave a voltage but left the frequency blank.
Both standard UK supply quantities are independently marked, so provide the potential difference and the frequency with their units.