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Unformatted text preview: depending on which we were measuring. The photo resistors resistance and voltage were measured both in the light and in a shaded region. The thermistors 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 99 1 R2 220 218 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 (k) Rmin (k) 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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- Spring '06