Pearson Edexcel International GCSE (9–1) · PHYSICS · Section
USING TRANSFORMERS TO CHANGE VOLTAGES
15 practice questions
Practice questions
1–10 of 15
Question 1
1 mark · Easy
Answer and check →Which part of a transformer is responsible for linking the magnetic field between the primary and secondary coils?
- A.Soft iron core
- B.Plastic casing
- C.Copper insulation
- D.Aluminium case
Question 2
1 mark · Easy
Answer and see the solution →State whether a transformer can be used with direct current (d.c.).
Question 3
1 mark · Easy
Answer and see the solution →What is the function of a step-up transformer?
Question 4
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 5
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 6
2 marks · Easy
Answer and see the solution →Explain briefly why a transformer is needed to distribute electricity over long distances.
Question 7
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 8
1 mark · Easy
Answer and see the solution →Name the two main types of transformers used in the transmission of electricity.
Question 9
4 marks · Normal
Answer and see the solution →A transformer has 150 turns on its primary coil and 450 turns on its secondary coil. The input alternating voltage is 12 V.
Calculate the output voltage across the secondary coil.
Question 10
3 marks · Normal
Answer and see the solution →Explain why transformers cannot be used with direct current (d.c.).