Working principle of the photodiode and photoresistor

AI Thread Summary
The discussion centers on the differences between photodiodes and photoresistors, specifically their working principles. A photoresistor alters its resistance in response to light, utilizing the principle of photoconductivity. In contrast, a photodiode generates a current when exposed to light, but the specific principle behind its operation remains unclear to the original poster. Participants suggest searching online for more detailed explanations, indicating that abundant resources are available. The conversation highlights the need for clarity on the operational principles of these two light-sensitive devices.
akzo
Messages
7
Reaction score
1
Hello everyone. I feel myself a little bit confused because I can't understand the difference between the working principle of the photodiode and the photoresistor. The photoresistor changes its resistance under the influence of light while photodiode changes the current across iself. Is this right? I also know that photoresistor use the principle called photoconductivity, but what principle is used by photodiode then? I guess there should be some difference, because why we are talking about resistance in one case and about current in another?

Thanks in advance.
 
Engineering news on Phys.org
Hi akzo! Does a google search lead you to finding out the basics of a photodiode?
 
Yes It did but I am still confused. I need to find the name of the working principle that lays in the basis of the photodiode, and I guess if I found the answer in google I wouldn't ask the question here.
 
akzo said:
Yes It did but I am still confused. I need to find the name of the working principle that lays in the basis of the photodiode, and I guess if I found the answer in google I wouldn't ask the question here.

how about typing in... How does a photodiode work ? into google
I got 100's of hits with various descriptions
 
Thread 'Weird near-field phenomenon I get in my EM simulation'

Thread 'Weird near-field phenomenon I get in my EM simulation'

I recently made a basic simulation of wire antennas and I am not sure if the near field in my simulation is modeled correctly. One of the things that worry me is the fact that sometimes I see in my simulation "movements" in the near field that seems to be faster than the speed of wave propagation I defined (the speed of light in the simulation). Specifically I see "nodes" of low amplitude in the E field that are quickly "emitted" from the antenna and then slow down as they approach the far...
View full post »

Thread 'EMF (Electromagnetic Field) & EHS (Electromagnetic Hyper Sensitivity)'

Hello dear reader, a brief introduction: Some 4 years ago someone started developing health related issues, apparently due to exposure to RF & ELF related frequencies and/or fields (Magnetic). This is currently becoming known as EHS. (Electromagnetic hypersensitivity is a claimed sensitivity to electromagnetic fields, to which adverse symptoms are attributed.) She experiences a deep burning sensation throughout her entire body, leaving her in pain and exhausted after a pulse has occurred...
View full post »

Similar threads

Need help with MOSFETs and photoresistors
Replies
31
Views
6K
Obtaining the series and shunt resistance of a photodiode from the datasheet
Replies
3
Views
3K
Solving the Debate Over Photon Counting With a Scintillation Device
Replies
7
Views
2K
Using a circuit with a photoresistor
Replies
16
Views
7K
Quadrant photodiode selection advice
Replies
1
Views
2K
How does this Dark Meter work?
Replies
5
Views
2K
Understanding Photodiode Behavior in Reverse Bias Circuits
Replies
4
Views
2K
Photodiode to dim a led in bright light and brighten in dim light
Replies
4
Views
3K
PIN Photodiode, High Voc, Low Isc
Replies
3
Views
2K
Beam centering using a photodiode
Replies
18
Views
4K

Hot Threads

Recent Insights

Back
Top