# How can I measure the internal resistance of a thermoelectric generator?

How can I measure the internal resistance of a thermoelectric generator? Can I use a standard multimeter? I am using a TEC1-12706B thermoelectric generator. I tried to use a standard multimeter to measure the internal resistance. Later I found that it is a positive component so that my measurement is wrong.

• What value did you get for the internal resistance? How did you try to measure it?
– JRE
Jan 24 at 7:49
• I connected a resistor to the thermoelectric generator and then measure the current through it, after that I used the formular R= U/I to calculated the internal resistor and found r= 517.8 Ohm Jan 24 at 8:18

• Measure the open-circuit voltage output, $$\ V_{OC} \$$.
• Connect the load and measure the voltage under load, $$\ V_L \$$.
• Calculate the current, $$\ I = \frac {V_L} {R_L} \$$.
• Calculate the voltage drop across $$\R_S\$$, $$\ V_d = V_{OC} - V_L \$$.
• You now have the voltage drop across $$\ R_S \$$ and the current through it so you can calculate, $$\ R_S = \frac {V_d} I \$$.