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18.1 Electrical Potential Energy pp. 666 - 669 Mr. Richter
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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
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Objectives: We Will Be Able To… Define electrical potential energy. Calculate electrical potential energy.
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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?
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Electric Field Lines
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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.
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Electric Field Lines Electric field lines show the combinations of electric fields from more than one charge. Opposite, equal charges.
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Electric Field Lines Electric field lines show the combinations of electric fields from more than one charge. Like, equal charges.
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Electric Field Lines Electric field lines show the combinations of electric fields from more than one charge. Opposite, unequal charges.
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Electrical Potential Energy
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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 (PE electric) ) is the energy stored in an object due to its position relative to a source of electric force.
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Electrical Potential Energy: Uniform Electric Field
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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.
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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
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Electrical Potential Energy: A Pair of Charges
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A single charge can also give potential energy to another charge. Again: Work = Force x Distance
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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.
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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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