The kinetic energy of electrons in electron volts:
, where K is the kinetic energy, e is the electron charge, and V is the potential difference.
Kinetic energy, in terms of speed, is expressed as:
, where m is mass and v is the speed.
We also need to remember that:
1eV = 1.6 × 10-19 J
We use the kinetic equation K = eV
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