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LDR Depth Meter Investigation

  • Thread starter RM-Smith
  • Start date
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1. The problem statement
I'm currently conducting an investigation into how a Light Dependent Resistor changes depending on the depth of a liquid above it. The experiment is pretty simple, however the write up is somewhat more problematic.
Firstly I'm asking whether I should read voltage, resistance or current from my multimeter
Secondly I have to find errors which may effect the results, explain them and collect further results to limit them, however I'm struggling to think of many, and how to limit them.



2. Homework Equations



3. The Attempt at a Solution
Question 1: I know I can use I=V/r, but really I need someone to let me know why I would measure in a particular one.
Question 2: Light from other sources is obviously a big one, and one which I can easily limit, and the factors involved in the opacity of the liquid is another (however I haven't chosen a liquid yet), but any other suggestions are greatly appreciated.
Any other advice would also be incredibly helpful, as this isn't my strongest aspect of physics.

Thanks in advance,
Robert
 

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