Consider a set up with a power supply(dc voltage) ,and a photocell (metal plate + collector) ,and an ammeter. Frequency of light is constant. When V gradually increases from 0 (anode linked to the collector, anode to the metal plate), the photoelectric current is said to be increasing until it reaches the saturated current. (from my book) But from my exercise, it says it wont increase because the current is not contributed by the dry cell, but by radiation. Once the photoelectrons are emitted, they tend to go round the circuit(because there is a potential no matter its value) and return to the illuminated metal. The dry cell cannot increase the number of photoelectrons. Which one is correct?