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4.5.6a Construction and operation of a transformer

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Question 24
a.

An initially unmagnetised steel rod is placed inside a solenoid.

Describe:

  1. How the steel rod can be magnetised using a power supply connected to the solenoid.
  2. How the magnetised steel rod can then be demagnetised.
[3]
b.

A mains transformer steps down a voltage of 220 V220\text{ V}220 V to 11 V11\text{ V}11 V. A component in the secondary circuit is connected in series with a 2.5 A2.5\text{ A}2.5 A fuse.

Assuming the transformer is 100%100\%100% efficient, calculate the current in the secondary coil when the current in the primary coil is 0.15 A0.15\text{ A}0.15 A, and predict whether the fuse will blow.

[3]
Markscheme

4.5.6a Construction and operation of a transformer Questions

  1. IGCSE
  2. /Physics
  3. /4.5.6a Construction and operation of a transformer

136 exam-style questions on CIE IGCSE Physics 4.5.6a Construction and operation of a transformer. Each one has a worked solution and a mark scheme showing where the marks go.

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