Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Electromagnetic Induction
61 practice questions
Topics covered
Practice questions
11–20 of 24 · Easy
Question 11
3 marks · Easy
Answer and see the solution →A transformer has 200 turns on its primary coil and 800 turns on its secondary coil.
(a)[1 mark]State whether this is a step-up or step-down transformer.
(b)[2 marks]If the voltage across the primary coil is 5 V, calculate the voltage across the secondary coil.
Question 12
3 marks · Easy
Answer and see the solution →A step-down transformer has 900 turns on its primary coil and 90 turns on its secondary coil. The primary voltage is 225 V.
(a)[2 marks]Calculate the secondary voltage.
(b)[1 mark]State one use for a step-down transformer.
Question 13
2 marks · Easy
Answer and see the solution →Explain briefly why a transformer is needed to distribute electricity over long distances.
Question 14
3 marks · Easy
Answer and see the solution →A transformer used for a phone charger has 500 turns on its primary coil and 100 turns on its secondary coil. The input voltage is 230 V.
(a)[1 mark]Is this transformer step-up or step-down? State why.
(b)[2 marks]Calculate the output voltage.
Question 15
1 mark · Easy
Answer and see the solution →Name the two main types of transformers used in the transmission of electricity.
Question 16
1 mark · Easy
Answer and see the solution →State the purpose of a step-down transformer in the National Grid.
Question 17
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 18
1 mark · Easy
Answer and see the solution →What does a step-up transformer do to the voltage of electricity?
Question 19
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 20
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.