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4.5 Electromagnetic effects

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Question 1

A smart doorbell system uses a step-down transformer connected to the mains supply to power the outdoor unit.

a.

Explain the function of a step-down transformer.

[1]
b.

State the name of the magnetic material from which the core of the transformer is made.

[1]
c.

The transformer has an input voltage of 230 V230\text{ V}230 V and an output voltage of 18 V18\text{ V}18 V. There are 460046004600 turns on the input coil.

Calculate the number of turns on the output coil.

[3]
d.

Electricity is transmitted from power stations through the National Grid at very high voltages.

State two advantages of transmitting electricity at high voltages.

[2]
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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