Question 488Electricity & Electronics - QMED

The correct answer is A) the electrical current exceeds the rated value of the fuse. Fuses are designed to protect electrical circuits by interrupting the flow of current when it exceeds the fuse's rated value. If the electrical current flowing through the fuse is higher than the fuse's capacity, the fuse will overheat and its metal element will melt, breaking the circuit and causing the fuse to blow. This prevents damage to the electrical system and potential fire hazards. The other options are incorrect because they do not directly relate to the reason a fuse would blow. Reversing the flow of current (option B), stopping an electric motor suddenly (option C), or connecting unequal resistors in parallel (option D) would not necessarily cause a fuse to blow unless the resulting current exceeded the fuse's rated value.