Pearson Edexcel International GCSE (9–1) · PHYSICS · Section
TRANSFORMERS AND NATIONAL GRIDS
17 practice questions
Practice questions
1–10 of 17
Question 1
1 mark · Easy
Answer and see the solution →State the purpose of a step-down transformer in the National Grid.
Question 2
2 marks · Easy
Answer and see the solution →Explain why it is important to use high voltages when transmitting electricity over long distances in the National Grid.
Question 3
1 mark · Easy
Answer and see the solution →What does a step-up transformer do to the voltage of electricity?
Question 4
1 mark · Easy
Answer and check →Which device is used to increase the voltage in the National Grid?
- A.A fuse
- B.A step-down transformer
- C.A generator
- D.A step-up transformer
Question 5
3 marks · Easy
Answer and see the solution →A simplified diagram of the National Grid is shown below. Complete the sentences about the use of transformers.
(a)[1 mark]Describe where in the National Grid a step-up transformer is used.
(b)[1 mark]Describe where in the National Grid a step-down transformer is used.
(c)[1 mark]Explain why step-down transformers are needed before the electricity is supplied to homes.
Question 6
2 marks · Easy
Answer and see the solution →Give one reason why transformers are essential in the National Grid. Then, name one device in your home that works at the voltage supplied after a step-down transformer.
(a)[1 mark]State one reason why transformers are used in the National Grid.
(b)[1 mark]Name one device in your home that operates at mains voltage (230 V).
Question 7
2 marks · Easy
Answer and see the solution →Describe what would happen if the National Grid did not use transformers.
Question 8
1 mark · Easy
Answer and see the solution →What is the approximate voltage supplied to homes after passing through a step-down transformer in the UK?
Question 9
2 marks · Normal
Answer and see the solution →State one purpose of a step-up transformer and one purpose of a step-down transformer in the National Grid.
Question 10
4 marks · Normal
Answer and see the solution →The diagram shows a simplified section of the National Grid.
National Grid: transformers and cables (a)[2 marks]Explain why a step-up transformer is used before electricity enters the transmission line.
(b)[2 marks]Explain why a step-down transformer is needed before electricity is supplied to consumers.