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18.1 Electrical Potential Energy

18.1 Electrical Potential Energy. pp. 666 - 669 Mr. Richter. Agenda. Warm-Up Additional Homework Electric Field Lines (17.3) Notes: Electrical Potential Energy Calculating Electrical Potential Energy In Uniform Electric Fields From a Single Charge. Objectives: We Will Be Able To….

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18.1 Electrical Potential Energy

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  1. 18.1 Electrical Potential Energy pp. 666 - 669 Mr. Richter

  2. Agenda • Warm-Up • Additional Homework • Electric Field Lines (17.3) • Notes: • Electrical Potential Energy • Calculating Electrical Potential Energy • In Uniform Electric Fields • From a Single Charge

  3. Objectives: We Will Be Able To… • Define electrical potential energy. • Calculate electrical potential energy.

  4. Warm-Up: • A positive and a negative charge are separated from each other and held apart. How is this similar to a stretched rubber band?

  5. Electric Field Lines

  6. Electric Field Lines • To visualize the electric field, electric field lines are drawn. • Rules: • Lines are drawn from positive charge to negative. • Number of lines drawn in proportional to strength of charge. • Lines do not cross.

  7. Electric Field Lines • Electric field lines show the combinations of electric fields from more than one charge. • Opposite, equal charges.

  8. Electric Field Lines • Electric field lines show the combinations of electric fields from more than one charge. • Like, equal charges.

  9. Electric Field Lines • Electric field lines show the combinations of electric fields from more than one charge. • Opposite, unequal charges.

  10. Electrical Potential Energy

  11. Electrical Potential Energy • An object some distance above the ground wants to fall. It has gravitational potential energy. • If a charge experiences a force (attraction or repulsion), it similarly wants to move. • Electrical potential energy (PEelectric)) is the energy stored in an object due to its position relative to a source of electric force.

  12. Electrical Potential Energy: Uniform Electric Field

  13. Electrical Potential Energy: Uniform Electric Field • A uniform electric field exists when all charges experience the same force (magnitude and direction) in the field. • A charge’s potential energy in the field depends on its distance from the source of electric force. • Just like the gravitational potential energy of an object depends on its distance above the ground.

  14. Electrical Potential Energy: Uniform Electric Field • Just like with other forms of potential energy, it’s really the change in position that is important. • Remember: • Energy = Work = Force x displacement

  15. Electrical Potential Energy: A Pair of Charges

  16. Electrical Potential Energy: A Pair of Charges • A single charge can also give potential energy to another charge. • Again: Work = Force x Distance

  17. Wrap-Up: Did we meet our objectives? • Calculate electric force using Coulomb’s law. • Calculate electric field strength. • Draw and interpret electric field lines. • Define electrical potential energy. • Calculate electrical potential energy.

  18. Homework • All due tomorrow! • p. 636 #3, 4 • p. 656 #41, 42 • p. 657 #55 • p. 669 Practice #2, 4 • p. 669 Section Review #5, 6

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