Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Electromagnetism
68 practice questions
Topics covered
Practice questions
31–33 of 33 · Easy
Question 31
1 mark · Easy
Answer and check →Which part of the National Grid comes immediately after electricity is generated at a power station?
- A.Step-down transformer
- B.Transmission cables
- C.Step-up transformer
- D.Domestic fuse box
Question 32
5 marks · Easy
Answer and see the solution →A transformer is used in a small wind turbine system to supply electricity from the generator to a farmhouse.
(a)[2 marks]Describe how a transformer works, including its main parts.
(b)[1 mark]State why an alternating current (a.c.) is necessary for a transformer to work.
(c)[2 marks]Explain how using a transformer in a National Grid system helps reduce energy losses during transmission.
Question 33
4 marks · Easy
Answer and see the solution →A coil of wire is connected to a sensitive ammeter as shown. A bar magnet is moved into and out of the coil.
Magnet and coil apparatus. (a)[1 mark]State what effect moving the magnet into the coil has on the ammeter reading.
(b)[2 marks]Explain why a current is induced in the coil when the magnet is moved.
(c)[1 mark]State two changes you could make to increase the size of the induced current.