(adsbygoogle = window.adsbygoogle || []).push({}); Calculating diamter of wire that will "blow" if current exceeds 1A

1. You need to design a 1.0 A fuse that "blows" if the current exceeds 1.0 A. The fuse material in your stockroom melts at a current density of 500A/cm^2.

2. J = I/A

3. J = 500A/m^2 = 50000A/m^2 = 1.0A / (pi*r^2)

r = sqrt[1/50000*pi] = 0.00252 m

diamter = 2*r = 0.005 m = 5.0mm

That is incorrect (answer in mm).

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# Homework Help: Calculating diamter of wire that will blow if current exceeds 1A

**Physics Forums | Science Articles, Homework Help, Discussion**