Thermionic emission of electrons (A-level only) Flashcards – AQA A-level Physics (7408)

What kinetic energy does an electron gain when it accelerates through a potential difference $V$?

$eV$, where $e$ is the magnitude of the electron’s charge.

An electron starts from rest and accelerates through a potential difference $V$. If all the work done becomes kinetic energy, what equation relates its final speed $v$ to $V$?

$\frac{1}{2}mv^2=eV$, where $m$ is the electron’s mass and $e$ is the magnitude of its charge.