An electron volt is the energy gained by an electron when it moves through a potential difference of
Correct answer: A. one volt
- A. one volt
- B. one joule
- C. 1000 volts
- D. one coulomb
Explanation
Since energy is charge multiplied by potential difference, one electron volt equals 1.6 times 10 to the minus 19 joules, the magnitude of the electronic charge in coulombs. The unit is convenient because joules are absurdly large for single particles. Electron volts and their multiples are the standard currency of atomic and nuclear physics.
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About Electric Potential
Electric potential is the work done per unit positive charge in bringing it from infinity to a point, while potential difference compares energy change between two points. Work includes potential due to point charges, superposition of scalar potentials, equipotential surfaces, and the relation between electric field and potential.
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