In a photoelectric experiment under conditions of saturation current, we consider two different cross-section $A$ and $B$ as shown. Here, $v_{A}$ and $v_{B}$ represent the average speed of electrons at the two cross-sections.

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Current at any cross-section is equal to the number of electrons coming out of cathode and this is also equal to the number of electrons entering each area per unit time.

Also $v_{dA} = v_{dB}$ , i.e, drift speeds are equal.

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