A safety device is fitted in household wiring to protect appliances from damage…
PHYSICS · Multi-part · CBSE · Physics · Electricity: Magnetic and Heating Effects · Electricity: Magnetic and Heating Effects
Problem
A safety device is fitted in household wiring to protect appliances from damage caused by excessive current.
(i) Define a fuse in the context of household electric circuits.
(ii) State where in the wiring (live, neutral or earth) this device is connected and give one reason for this placement.
(iii) Explain the working principle of an ordinary fuse wire when the current in the circuit suddenly rises above its rated value.
(iv) Distinguish between a fuse and a miniature circuit breaker (MCB) on any two points relevant to domestic safety.