Calculations

Calculations for part A

Vopen circuit (Voc) = 7.15 mV

Voutput (Vo) = 7.13 mV

Change in V = .02 mV

Rload = 20 kohm

Vo=Voc(Rl / (Rl + Rs))

.00713 = .00715 ( 20000 / (20000 + Rs)

.9972 = ( 20000 / (20000 + Rs))

Rs = 56 ohms

Calculations for part B

Voc = 340.5 mV

Vo = 162.6 mV

Change in V = 177.9 mV

Rload = 7.6 ohms

Vo=Voc(Rl / (Rl + Rs))

162.6 = 340.5 ( 7.6 / ( 7.6 + Rs))

7.6 + Rs = 7.6 (340.5 / 162.6)

Rs = 8.32 ohms