Skip to content

Course home

Sign up

4.5 Electromagnetic effects

EasyMedium
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768
Question 5

A student notices that the mains cable of a smart speaker has been damaged, exposing the copper wires inside.

a.

State the hazard of touching an exposed live wire of a damaged power cable.

[1]
b.

Explain how a fuse protects an electrical appliance when a fault causes a very large current to flow.

[3]
c.

The power adapter for the smart speaker uses a transformer to reduce the voltage of the mains electricity supply.

  • The input (primary) voltage is 220 V220\text{ V}220 V.
  • The input (primary) coil has 110011001100 turns and the output (secondary) coil has 454545 turns.

Calculate the output (secondary) voltage from the transformer.

output (secondary) voltage = ............................................................ V\text{V}V

[3]
d.

State the name of the material used in the core of the transformer.

[1]
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.

Question bank