Technician exam question T0A04
Subelement T0, SAFETY· Group T0A
What is the purpose of a fuse in an electrical circuit?
- A.To prevent power supply ripple from damaging a component
- B.To remove power in case of an overload (correct answer)
- C.To limit current and prevent shocks
- D.All these choices are correct
WhyA fuse's purpose in an electrical circuit is to remove power in case of an overload. A fuse is designed to melt and open the circuit when current exceeds its rating, removing power before an overload can damage wiring or equipment or start a fire, answer B. It doesn't specifically address power supply ripple (A), and while a properly sized fuse can indirectly reduce shock risk in some fault conditions, "limiting current to prevent shocks" isn't its defining function (C), so D, which depends on both of those being accurate, is also wrong.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2026-2030 NCVEC Element 2 pool (public domain); the explanation above is original writing, see our methodology.
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