Dependent Resistor
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 New 10pcs 5528 Photo Light Dependent Resistor Photoresistor US $4.59 
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 LDR (Light Dependent Resistor) - NEW US $9.95
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 10pcs 5516 Photo Light Dependent Resistor Photoresistor US $2.30
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question about Light Dependent Resistors or LDRs?
i know that when the light intensity of a light source falling on an LDR is high, the resistance in the LDR falls and when the light intensity is low, the resistance of the LDR is high.
and i know that when resistance is high, current flowing through the LDR is low and vice versa.
however, whats the relationship between the voltage and the current in an LDR? are they directly or inversely proportional?
if the current in an LDR rises, will the potential difference also rise or fall?
this is quite important as i need it for this sensor i'm making at school.
if u've got ur information from a website, could you also mention the website here or create a link?
thanks
Depends on where you are measuring the voltage and what the rest of the circuit looks like. If you are measuring across the LDR, the voltage difference will drop as the current flow increases with lowered resistance. If you are measuring the potential to ground down stream of the LDR, the voltage should go up as the resistance drops.
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April 18th, 2008 in
Uncategorized | tags: arduino, dependent resistor, dependent resistor circuit, diy, electronics, ldr, led, light, light dependent resistor, photocell, resistor, temperature dependent resistor, voltage dependent resistor