Question

Which physical quantity does thr electon volt measure?

Answer 1

Electron volts is the unit of energy or work done. It is an extremely small unit of energy. An electron volt is the energy gained by an electron in moving through a potential difference of 1 volt.

Now energy gained by charge q in moving through a potential difference of v is given by E = q v . In case we use electrostatic units (esu) of charge and potential difference than energy of 1 electron volt would come in ergs. Let us work out how much is 1 electron volt (eV; e is written in lower case and V is always in upper case letters).

1 eV = charge in esu on an electron × 1 volt in esu = 4.8 × 10^10 esu × (1/300) esu of potential difference = 1.6 × 10^-12 erg.

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