Question

An electron initially at rest is accelerated through a potential difference of one volt. The energy gained by the electron is:

• A. $1J$
• B. $1.6\times {10}^{-19}J$
• C. ${10}^{-19}J$
• D. None of these

Answer 1

Answer: (B)

$1.6\times {10}^{-19}J$

We know that the electrical potential energy is given by , $U=qV$

For a electron, $U=eV=(1.6\times {10}^{-19})\left(1volt\right)=1.6\times {10}^{-19}J$