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GCSE Questions: Energy Sources

Q24. The diagram shows part of the National Grid linking a power station to consumers.

(a) Name the parts of Figure 2 labelled A and B.

[2 marks]

(b) Electricity is transmitted through A at a very high potential difference.

Which of the following is the advantage of transmitting electricity at a very high potential difference?

(Tick one box)

A high potential difference is safer for consumers.  
Less thermal energy is transferred to the surroundings.  
Power transmission is faster.  

 

[1 mark]

(c) The power station generates electricity at a potential difference of 25 kV.

The energy transferred by the power station in one second is 500 MJ.

Calculate the charge flow from the power station in one second.

[4 marks]

(Total 7 marks)