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Physics Day 15

Physics Day 15. LO: Discover how work is done and potential energy is stored in an electric field. LO: Define electric potential and potential difference. AGENDA Do Now Notes Worksheet HW05 Thursday. Do Now: Pick up Electric Circuits Lab Sheet Do “PHET” Lab. Electric Potential Energy.

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Physics Day 15

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  1. Physics Day 15 LO: Discover how work is done and potential energy is stored in an electric field. LO: Define electric potential and potential difference. AGENDA Do Now Notes Worksheet HW05 Thursday • Do Now: • Pick up Electric Circuits Lab Sheet • Do “PHET” Lab

  2. Electric Potential Energy

  3. A Kiwi Question • Kiwi (mass 9 kg) illegally climbs onto Mrs. B’s dining room table 1.3 meters high. • How much work did Kiwi do? • What is his PE on the table?

  4. The Kiwi Answer • Work = Force x Distance • Work = mg x h • PE = mgh

  5. Now with Electricity • How much work is done moving particle “q” from A to B? • What is the change in Potential energy?

  6. Now with Electricity • Work = F. d • F = E.q • Work = E.q.d

  7. Work and Potential Energy • There is a uniform field between the two plates • As the positive charge moves from A to B, work is done • WAB=F d=q E d • ΔPE =-WAB=-q E d • only for a uniform field

  8. Electric Potential Difference • But what is the work per unit charge? WAB=F d=q E d WAB/q = E d We call this Electric Potential and it is measured in Volts

  9. Electric Potential Difference Volts = Work/q = PE/q

  10. Problem • When a charge of -4e-3C is moved between two points in an electric field, 0.8 joules of work is done on the charge. • Calculate the potential difference between those two points.

  11. Electron Volts. has units of energy Note that the product: The “electron volt”, eV is a common unit for energy in particle physics. It is the amount of kinetic energy that an electron obtains when it is accelerated by a potential difference of one volt:

  12. Problem 2 • Calculate the work done on an elementary charge that is moved between two points in an electric field with a potential difference of 2 Volts?

  13. Unit Pit Stop Potential Energy Electric Field Electron-Volt

  14. Problem 3 • A charge, equal to 2e7 elementary charges, is moved through a potential difference of 300 volts. • What is the change in potential energy?

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