Lab1 - depending on which we were measuring The photo...

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2. Objective: To compare theoretical predictions of calculated quantities to EWB simulation results as well as with NI circuit board measurements. Kirchhoff’s and Ohm’s Laws should be validated by each method used: hand calculations, EWB simulation, and physical NI circuit board measurements. Percent error is also calculated to display differences in data allocation methods. Additionally, photo resistor and thermistor properties are explored. 3. Procedure: We began by powering the circuit using, the two resistors were connected in series as seen in Figure 4. Then we found the measured value of the voltage and the resistances of R 1 and R 2 . The voltage divider equation was then used to give calculated values of V 1 and V 2 . The actual value of V 1 and V 2 was then measured. The next part of the lab involved measuring the resistance and voltage of a photo resistor and a thermistor in different environments. The R 1 resistor is taken from the circuit and replaced with either the photo resistor or the thermistor
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Unformatted text preview: depending on which we were measuring. The photo resistor’s resistance and voltage were measured both in the light and in a shaded region. The thermistor’s resistance and voltage were measure at first at room temperature. Then the thermistor is heated up by holding it in the palm of your hand. Then the new results were measured. 4. Results: NOMINAL MEASURED % ERROR R1 100 Ω 99 Ω 1 R2 220 Ω 218 Ω 0.91 Vs 5 V 4.66 V 6.8 CALCULATED MEASURED % ERROR V1 3.44 V 3.19 V 7.2 V2 1.56 V 1.47 V 5.92 Rmax (kΩ) Rmin (kΩ) V2max (V) V2min (V) Photoresistor 44.9 1.5 3.73 .64 Thermistor 4.85 3.49 1.57 1.25 5. Conclusion: Photo resistor increases resistance and voltage in more shaded conditions Thermistor increases resistance and voltage in colder conditions A practical example of a variable resistor would be a street light that uses a photoresistor to determine when to come on....
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Lab1 - depending on which we were measuring The photo...

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