Pearson Edexcel International GCSE (9–1) · PHYSICS · Section
USING TRANSFORMERS TO CHANGE VOLTAGES
15 practice questions
Practice questions
1–8 of 8 · Easy
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.