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4.5 Electromagnetic effects

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Question 21

An appliance, such as a microwave oven, is connected to a 230 V230\text{ V}230 V a.c. mains electricity supply.

a.

The microwave oven has an on-off switch in one of the wires connecting it to the mains supply. State and explain which wire includes the switch.

[2]
b.

Internally, the microwave oven uses a transformer to change the 230 V230\text{ V}230 V a.c. voltage to a 2300 V2300\text{ V}2300 V a.c. voltage.

State the name of this type of transformer.

[1]
c.

Describe the construction of this transformer.

[4]
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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