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Unformatted text preview: 1 resistor is taken from the circuit and replaced with either the photo resistor or the thermistor 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 220 ohm ohm R2 100 ohm ohm Vs 5 V CALCULATED MEASURED % ERROR V1 1.56 V 1 V2 3.44 V 3 Rmax Rmin V2max V2min Photoresistor Thermistor 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