ELECTRIC POTENTIAL ENERGY

ELECTRIC POTENTIAL ENERGY

1. When a force is conservative then the work depends only on the initial and final positions

   • The potential energy depends on the position of an object,
     • WAB= -AU=UA-UB
       • The subindexes A and B refer to the initial and final position respectively

2. A conservative electric force is then, when the work done by the electric force is the same when a charge changes position (from A to B) regardless of the path taken.

   • U=qEr
     • The work done by the electrical force is then:
       • Wab=Ua-Ub=qEra-Erb

3. Potential energy can be associated to any system in which a particle is located within an electric field and receives the action of an electrostatic force.

   • • Colletion of point charges

4. The electric potential or work per unit charge that you analyzed in the previous lesson can be calculated for both point charges and systems of point charges.

   • Electric potential of a collection of point charges
   • Potential difference

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