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CAIE IGCSE Physics Iron-Cored Transformer Operation

Practise explaining the complete transformer sequence from alternating primary current to changing core field and induced alternating secondary voltage.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • state that alternating current in the primary coil produces a continuously changing magnetic field
  • explain that the soft-iron core strengthens and links the changing field with the secondary coil
  • state that changing flux through the secondary induces an alternating voltage and current if closed

4.5.6.6—Principle of operation of a simple question 1

[Maximum number: 3]

Fig. 10.1 shows a transformer that consists of two coils P and Q, and an iron core.

Fig. 10.1

Fig. 10.1

There are 200 turns on coil P and 340 turns on coil Q.

A4.0 V a.c. power supply is connected to coil P.

Explain why there is a voltage between the two terminals of coil Q .

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