__8.16__**Note that this solutions uses
notation from the text, which differs very slightly
from some of the lecture notes regarding uncertainty.**

Vs = 2V ±0.2%

V0 = 12.5 mV ±0.3%

S = 2.09 ±0.5%

R2 = 120 W ±0.1%

R3i = 120 W ±0.15%

We can use Eq. 8.22 to estimate the strain:

To obtain the uncertainty we will use Eq. 7.4. To use this, we need the partial derivatives with respect to each of the independent variables:

wR3i = 120´0.0015 = 0.18W

wR2 = 120´0.001 = 0.12W

wS = 2.09´0.005 = 0.0105

wVs = 2´0.002 = 0.004 V

wV0 = 12.5´10-3´0.003 = 0.0000375 V