question_answer

Which factor is immaterial for the wire used in electric fuse?

A)  Length                                

B)  Radius

C)  Material                                             

D)  Current

Correct Answer: A

Solution :

                 Electric fuse is a type of over current protection device. They are engineered to contribute a negligible amount of extra resistance to the circuits they protect.  This is largely accomplished by making the fuse wire as short as possible. Fuse are primarily rated as current amperes. A fuse wire of certain material and gauge will blow at a certain current no matter how long it is Since, length is not a factor in current rating the shorter it can be made the less resistance it will have end to end.