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CAIE IGCSE Physics 4.4.3 Use and Operation of Trip Switches and Questions

Learn how excess current melts fuses or opens trip switches to break a circuit safely.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • choose a fuse rating just above normal appliance current
  • explain how excess current melts a fuse or opens a trip switch
  • interpret circuit-breaker graphs to decide when current trips

CAIE IGCSE Physics 4.4.3 Use and Operation of Trip Switches and Questions question 1

[Maximum number: 1]

An electric iron has a power of 2400 W . The potential difference (p.d.) of the mains supply is 220 V .

Fuse ratings of 3 A,5 A,10 A,13 A3 \mathrm{~A}, 5 \mathrm{~A}, 10 \mathrm{~A}, 13 \mathrm{~A} and 30 A are available.

State which of these fuse ratings is suitable for use in the iron.
fuse rating

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