A source of potential difference (a battery or generator) moves Avogadro\'s numb

Question

A source of potential difference (a battery or generator) moves Avogadro's number of electrons from an initial point where the electric potential is 6.80 V to a point where the electric potential is -8.90 V? (The potential in each case is measured relative to a common reference point.)

1. Are the electrons moving in the direction of E or in the opposite direction

2.How much work is done by the source of potential difference

3.What is the change in the potential energy of the electrons? Does it increase or decrease ?

Explanation / Answer

potential difference which the electrons cover = final potential - initial potential

= -8.9 - 6.8 = - 15.7 V

1) As the potential difference is negative , so the electron moved along the direction of field

2) work done = charge * potential diff

=6.022 *10^ 23 * 1.6 * 10^-19 Coulomb * ( -15.7 Volts)

= - 1.513 * 10^6 Joules

3) The potential energy of electrons decrease

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