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AP Physics Chapter 17 Electric Potential and Electric Energy; CapacitancePowerPoint Presentation

AP Physics Chapter 17 Electric Potential and Electric Energy; Capacitance

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### AP Physics Chapter 17Electric Potential and Electric Energy; Capacitance

17-1 Electric Potential and Potential Difference

Potential or electrical potential is the potential per unit charge. Va=Pea/q

Potential difference is the difference is the work done by the electric force in moving a charge from point a to b. Vab=Va-Vb=-Wba/q

The SI unit for DV is the volt… J/C

DV=PEb-Pea=qVba

17-1 (Cont’d)

- See chart and diagram p 504
- See Example 17-1 p505

17-2 Relation Between Electric Potential and Electric Field

- W=qVba
- W=Fd=qEd where d is the distance ll to field lines from point a to b…
- qV=qEd …so V=Ed and E=V/d
- See Example 17-2 p 506

17-3 Equipotential Lines

- Equipotential lines, or in 3-D, equipotential surfaces are areas of equal potential and are perpendicular to the electric field at any point. (See pg. 507 diagram.)
- There can be no electric field in a conductor in the static state.

17-4 The Electron-Volt …a unit of Energy

- 1eV= 1.6 x10-19J
- You must use the J value to calculate with KE=1/2 mv2

17-5 Electric Potential Due to Point Charges

- V=k Q/r = 1/(4pe0) (Q/r) for a single pt. charge.
- See Example 17-3 p509
- See Diagrams pg 509See Example 17-4 and 17-5 p510/511

HOMEWORK

- P522 1-8&10,13-14 due Tuesday BOP

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