A room heater marked 1000 W, 230 V is protected by a 15 A fuse instead of the…
PHYSICS · Single correct · CBSE · Physics · Electricity: Magnetic and Heating Effects · Electricity: Magnetic and Heating Effects
Problem
A room heater marked 1000 W, 230 V is protected by a 15 A fuse instead of the recommended 5 A fuse. If a fault causes the heater to draw 10 A, what is the most likely outcome?
(a) The 15 A fuse will blow, cutting off the current and keeping the circuit safe.
(b) The fuse will stay intact and the heater may overheat, creating a fire hazard.
(c) The higher current will lower the voltage across the heater, so it will run cooler than normal.
(d) The main household MCB will trip immediately, even though the 15 A fuse survives.