Download PHYS 2220: Physics for Scientists and Engineers II

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5. (a) A fuse “blows” if the current exceeds 1.0 A. It is made of material that melts at a current density
of 620 A/cm2 . What is the diameter of the wire in the fuse?
(b) Using the fuse from part (a), you create the circuit below with an EMF, a 100 W light bulb,
and the fuse. How high can the EMF be before the fuse blows? Assume the fuse has no internal
resistance and that the light bulb has a rated resistance of 140 Ω.
5
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