# Electric potential

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Electric potential and potential difference.
Part 1
Part – 1 continued
The work, W, done by the electric
field, E, to move the charge a distance
The charge in electric potential
energy equals the negative work
done by the electric field:
The positive charge q has the greatest potential
energy at point a, near the positive plate. The
reverse is true for a negative charge: its potential
energy is greatest near the negative plate
Thus a positively charged object moves
naturally from high potential to a low
potential. A negative charge does the
reverse.
Now let’s talk about voltage and energy…
Part 1
Part 2
Electric potential is given by symbol V. Electric potential is measured in volts (1 V=
1 J/C) and is sometimes referred to as voltage.
If a positive test charge, q, has electric potential, PE,
at some point a (relative to some zero potential
energy), the electric potential, V, at this point is
The difference in potential energy, PE(b) – PE(a), is
equal to the negative of the work, W(ba), done by
the electric field to move the charge from a to b;
so the potential difference V(ab) is
Joules is a very large unit to use when dealing with the small
energies of electrons so a new unit is defined.
Work kinetic energy theorem
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