In this lab, we are going to connect a constant resistor, a changing resistor with temperature, and a constant voltage. And we guess that the changing temperature will affect total resistor. At room temperature, it has 11000 ohm resistance. But when we use hand to touch it, it has 7000 ohm resistance. In order, we change is greater than 0.5. And by calculating we use theoretical value of 7k ohms at room temperature and 11k ohms as 37 degree.
The voltage is 5.0 V.
After we set up, at the room temperature, the Vout is 3.38 V
After we warm the resistor with body temperature, the Vout is 2.68 V.
In the lab we got a voltage is 0.7V; however, our theoretical should be 0.533V. our % difference is -31.3%. I think this problem is caused the by our teammater's hand is highter.
Post lab of this experiment.
We are asked to design a new circuit and that device must be at least 0.1 V/degree.
Depending to our calculation, it is impossible to get it. The maximum voltage we can get a is 0.563 V in 12 degree’s difference. In fact, Our lab data is bigger than the maximum probably the difference in our temperature is higher than 12 degrees.
video about our experiment.
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