# Chapter 20: Fuses¶

### Example 20.1, Page Number: 495¶

In [1]:
from __future__ import division

#Variable declaration:
r1 = 0.8                   #radius of fuse wire(mm)
I1 = 8                     #blow current at r1 radius(A)
I2 = 1                     #blow current(A)

#Calculation:
r2 = r1*(I2/I1)**(2/3)       #radius for bearing 1 A of blow current(mm)

#Result:
print "The radius of the wire that will blow off at a current of 1A is",r2,"mm"

The radius of the wire that will blow off at a current of 1A is 0.2 mm