Admin How does a fuse use resistance?
Answer. A fuse wire has high resistance and low melting point because when the high current passing through the circuits a fuse will resist the high current and protected the other electric appliances being damaged. A fuse wire melts easily if a high current passes through the circuit.
Does a fuse provide resistance?
Fuses are designed to have very low resistance so that they don’t unduly interfere with the circuits that they are protecting. This low resistance means that the voltage drop across the fuse will be very small.
Why does fuse have high resistance?
A fuse wire should have a high resistance so that according to (1), a lot of heat is generated and it is easier for the fuse wire to reach its melting point. Also, a high resistance decreases the current flowing in the circuit than what would have been in the absence of it.
Why are fuses used for protection of resistive loads?
Fuses are sacrificial devices used to protect much more expensive electrical components from the damaging effects of overcurrent. When too much current flows through the low resistance element of the fuse, the element melts and breaks the circuit.
What is the resistance of a blown fuse?
If the reading is between 0 and 5 Ω (Ohms), the fuse is good. A higher reading indicates a bad or degraded fuse. A reading of OL (Over Limit) definitely means a blown fuse. If the fuse is blown, replace the fuse with one that is exactly the same (see panel).
Does fuse have high resistance or low resistance?
Fuse has low resistance with comparison to the load resistance of the circuit but has high resistance when compared to the wire of same length. Thus when asked weather a fuse has high resistance or low resistance, we should answer that a fuse has high resistance with low melting point.
Does fuse have high specific resistance?
The purpose of a fuse is to limit the amount of current flowing through a circuit. Hence, the correct answer is option A that the specific resistance of fuse wire is high.
How does a fuse protect from a short circuit?
A fuse or circuit breaker prevents this by ”blowing,” or breaking the circuit, when an overload occurs. Fuses screw into threaded sockets inside the fuse box. The fuses contain a thin strip of metal that melts if the current (or amperage) flowing through that circuit exceeds the amount for which that fuse is rated.