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Transcript
The electron-volt: eV “energy gained by an electron moving through an electric potential difference of one volt. (OR: Work done moving an electron through an electric potential difference of one volt.)” Situations: eV An electon passing through a resistor across which there is a potential difference of 3V (3 eV of thermal energy transferred to the R) An electron passing though a generator that is generating an e.m.f of 24V. (24 eV of Ep transferred to the e-) An electron accelerates across a 9V electric field (9eV of Ek) How much energy? 1 Volt is 1 Joule per coulomb. An electron has a charge of 1.6 x 10-19 coulombs So 1eV is 1.6 x 10-19 Joules In a coulomb of charge there are therefore: 1/ 1.6 x 10-19 electrons = 6.25 x 10+18 electrons. So 1 Joule is 6.25 x 10+18 eV