On Wednesday, 12 February 2020 10:29:32 UTC, RobH  wrote:   
      
   > I could not measure the resistance of the ldr correctly as it was either   
   > off scale on the meter, or a negative resistance, depending on which way   
   > round I had the positive and common leads on it.   
   >   
   > The Vc of the resistor voltage in the dark is 4.8v   
   > The Vc of the resistor voltage in the light is 6.8v   
   >   
   >   
   > Apologies for any confusion I may have  caused.   
      
   If you're measuring an LDR as negative resistance, something is seriously   
   wrong with what you're doing.   
      
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