MEDIUM
Upper Secondary-IGCSE
IMPORTANT
Earn 100

A fuse relies on the earth wire to work. State why some devices must have an earth wire, whilst others do not require one. 

Important Questions on Electrical Circuits

EASY
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 19 - Electrical Circuits>Exercise 19.6>Q 2
State where the earth wire is connected to, apart from the device.
EASY
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 19 - Electrical Circuits>Exercise 19.6>Q 3

Describe what safety issue is shown in the figure.

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EASY
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 19 - Electrical Circuits>Exercise 19.6>Q 4
Explain the operation of a fuse.
EASY
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 19 - Electrical Circuits>Exercise 19.6>Q 4
Explain why fuse is a safety device.
EASY
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 19 - Electrical Circuits>Exercise 19.6>Q 4
State the worst case scenario for the house if the fuse is replaced with a metal foil. Explain your answer. 
EASY
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 19 - Electrical Circuits>Exercise 19.6>Q 5
Explain the operation of a trip switch.
MEDIUM
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 19 - Electrical Circuits>Exercise 19.6>Q 6
State the sequence of events that leads to fuse melting.
EASY
Upper Secondary-IGCSE
IMPORTANT
Physics for Cambridge IGCSE workbook>Chapter 19 - Electrical Circuits>Exercise 19.6>Q 7
Someone is operating an electric hedge cutter whilst standing on wet grass. The cable is cut by accident. Explain why it is unlikely that a fuse will save the life of the operator.