How is Work Calculated in an Electric Field?

[jsmith613]

Homework Statement

Homework Equations

The Attempt at a Solution

now I know this has something to do with energy done on electron and KE.

apparently work done on electron is:
W = eV

BUT surely this implies V is constant. as the charge moves, will not V change?
hence it should be
W = 0.5*eV?

 

[jsmith613]

found it
my book says V is the p.d that charges MOVE THROUGH not are in :)