An electrical system employs fuses that are cylindrical in shape and have lengths of 0.5 cm and

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An electrical system employs fuses that are cylindrical in shape and have lengths of 0.5 cm and diameters of 0.1 mm. Air, at 30°C, surrounds a fuse with a surface coefficient of 10 W/m2 ? K. The fuse material melts at 900°C.

Assuming all heat transfer to be from the fuse surface, estimate the time it will take for the fuse to blow after a current of 3 A flows through it.

Pertinent properties of the fuse material are

Resistance = 0.2 Ω

k = 20 W/m · K

α = 5 × 10^-5 m² /s

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Fundamentals Of Momentum Heat And Mass Transfer

ISBN: 9781118947463

6th Edition

Authors: James Welty, Gregory L. Rorrer, David G. Foster

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Question Posted: Oct 31, 2018 10:43 AM

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An electrical system employs fuses that are cylindrical in shape and have lengths of 0.5 cm and

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Fundamentals Of Momentum Heat And Mass Transfer

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