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4.5 Electromagnetic effects

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Question 60

In a steam-driven power station, high-pressure steam is used to rotate a shaft, which is then used to generate electricity.

a.

State the name of:

  • The component XXX that is rotated directly by the high-pressure steam.
  • The component YYY that is turned by this shaft to produce electrical energy.
[2]
b.

Describe two useful energy transfers that take place in this power station, starting from the fuel being burned up to the electrical energy produced.

[2]
c.

The power station contains a step-up transformer:

  • The primary voltage VpV_pVp​ is 18 000 V18\,000\text{ V}18000 V.
  • The number of turns on the primary coil NpN_pNp​ is 500500500.
  • The number of turns on the secondary coil NsN_sNs​ is 750075007500.

Calculate the secondary voltage VsV_sVs​ for the transformer.

[2]
d.

Give two reasons for transmitting electrical energy through the grid at very 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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