You yourself can now configure from the figure itself that how the whole thing works.This is the most common way and simplest way to study photoelectric effect.This whole arrangement contains two plates placed parallel to each other and are connected in series with the battery and the ammeter .The plate that is connected to positive terminal of the battery is called the collector as it collects the electrons that are ejected from the plate that is connected to the negative terminal of the battery .When the whole glass tube containing the two plates is kept in darkness no current will flow through the circuit .Now as soon as the cathode is illuminated by certain radiation(please refer to the definition that i have mentioned in the photoelectric effect post),the microammeter at once registers a current which now strengthens our concept that due to the impact of radiation on cathode electrons are emitted and are received by the collector and it completes the circuit .
To study the effect of intensity of light on photoelectric current
Now the first question that strikes our mind that what will happen if we increase the intensity of light.The first thing you need to do is to fix the frequency of incident light and accelerating potential
(delivered by the battery)and after that you should gradually increase the intensity of light and observe it's effects on the microammeter .Now,what will you observe??
You will observe that photoelectric current increases linearly with the intensity of light as depicted in the above image.This means that the number of photoelectrons ejected per sec is directly proportional to the incident light.
If you any questions just let me now.
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