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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

https://www.youtube.com/watch?v=LkIai_KXGxg

Part 2

https://www.youtube.com/watch?v=NrpFMyVLSck

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