TP 21.17

Given: r = 0.15 W-m

To estimate let’s assume that

l = 10.0 cm

r = 1.00 cm

(a) Find: R - ?

R = r l /A

R = (0.15 W-m)(0.100 m)/(p (1.00 x 10^-2 m)²) = 47.7 W or about 50.0 W

(b) Find DV - ?

DV = I R = (0.0150 A)(50.0 W) = 0.750 V