import numpy as np

strom = np.loadtxt('http://techteach.no/python/files/strom.txt',
                   dtype='float')

summen = 0.0
ant_min = 0
iter = 0
grense = 2

while summen < grense:
    
    summen += strom[iter]
    ant_min += 1
    iter += 1

print('Det tar', ant_min, 'minutter')