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4.5 Electromagnetic effects

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Question 33

A mobile phone charger is connected to the mains supply using a step-down transformer.

a.

Draw a labelled diagram of the structure of a basic step-down transformer.

[3]
b.

Explain the operation of a basic transformer.

[4]
c.

The voltage of the mains supply is 120 V120\text{ V}120 V. The output voltage of the transformer is 5.0 V5.0\text{ V}5.0 V.

Calculate the value of the turns ratio NsNp\frac{N_{\text{s}}}{N_{\text{p}}}Np​Ns​​. Give your answer to two significant figures.

[3]
Markscheme

4.5 Electromagnetic effects Questions

  1. IGCSE
  2. /Physics
  3. /4.5 Electromagnetic effects

275 exam-style questions on CIE IGCSE Physics 4.5 Electromagnetic effects, covering 4.5.1a Electromagnetic induction, 4.5.1b Direction of an induced e.m.f., 4.5.2 The a.c. generator, 4.5.3a Magnetic effect of a current and its applications, 4.5.3b Strength and direction of the field around wires and solenoids, 4.5.4a Force on a current-carrying conductor, 4.5.4b Force on beams of charged particles, 4.5.5 The d.c. motor, 4.5.6a Construction and operation of a transformer, 4.5.6b Turns ratio and current in a transformer, and 4.5.6c High-voltage transmission of electricity. Each one has a worked solution and a mark scheme showing where the marks go.

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