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Retrieved May 5, The Physics Classroom. Nave, C. Power per Unit Area of Surface. Retrieved May 23, Jameco Electronics n. Science Buddies. How to use a Multimeter.

Note: A computerized matching algorithm suggests the above articles. It's not as smart as you are, and it may occasionally give humorous, ridiculous, Digital Roller Tape Measure Youtube or even annoying results!

Learn more about the News Feed. You will need the following items from the kit. Photoresistor Digital multimeter Alligator clip leads 2 You will also need the following items not included in the kit : Lamp and lightbulb Tape measure Tape Cardboard box, or other item to make a platform so you can rest the photoresistor level with the lightbulb Dark room in which to do the experiment; the room should have as few external light sources as possible.

Figure 2. How to connect your multimeter to the photoresistor. Figure 3. Experimental setup. Photonics Engineer. Variations How does the resistance of the photoresistor change with distance? Make a plot of resistance versus distance. What is the mathematical relationship between resistance and distance? If you just glance at the graph, it might appear quadratic resistance increases with distance squared , but is that actually the case?

Equation 1 is derived from the graph on the photoresistor's datasheet. Can you derive Equation 1 yourself using the graph? This will require knowledge of log-log plots. The graph only shows a calibration range for the sensor from 1— lux.

The readings in your experiment may have exceeded this range. Can you be sure that the calibration curve is still linear on a log-log plot at higher or lower illuminance values? Use a lux meter to create your own calibration curve for the photoresistor over the range of illuminance values from your experiment.

Does it match the graph from the datasheet? You can also do more research into the typical relationship between resistance and illuminance for photoresistors and examine the shape of the curve.

What does this say about the validity of your results using Equation 1? Do your results change if you do the experiment with different types of lightbulbs; for example, incandescent, compact fluorescent CFL , or light-emitting diode LED?

What about lightbulbs of different color temperature for example "warm white" or "daylight"—look on the lightbulb's packaging to find the color temperature? Does the wavelength of light emitted appear to have an effect on the inverse square law? Ask an Expert The Ask an Expert Forum is intended to be a place where students can go to find answers to science questions that they have been unable to find using other resources. If you have specific questions about your science fair project or science fair, our team of volunteer scientists can help.

Our Experts won't do the work for you, but they will make suggestions, offer guidance, and help you troubleshoot.

Ask an Expert Contact Us If you have purchased a kit for this project from Science Buddies, we are pleased to answer your questions. In your email, please follow these instructions: What is your Science Buddies kit order number?

Please describe how you Digital Tape Measure Canadian Tire Youtube need help as thoroughly as possible: Examples Good Question I'm trying to do Experimental Procedure step 5, "Scrape the insulation from the wire. Bad Question I don't understand the instructions. Good Question I am purchasing my materials. Can I substitute a 1N34 diode for the 1N25 diode called for in the material list?

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