Question
What is the purpose of a fuse in an electrical circuit?
Answer Options
- A) To prevent power supply ripple from damaging a component
- B) To remove power in case of overload
- C) To limit current to prevent shocks
- D) All these choices are correct
Correct Answer: B
Explanation
The primary and most critical function of a fuse is to act as a weak link that deliberately breaks the circuit if the current becomes too high, which is known as an overload. When excessive current flows, usually due to a malfunction or a short circuit, the heat generated melts the thin wire inside the fuse, opening the circuit and stopping the current.
This action immediately removes power in case of overload, preventing damage to the equipment, wiring, and, most importantly, preventing a fire. Fuses are an inexpensive, passive safety component designed purely to protect against over-current conditions.
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