2. AP Physics Chapter 17 Electric Potential and Electric Energy; Capacitance 17-1 Electric Potential and Potential Difference Potential or electrical potential is the potential per unit charge. V a =Pe a /q Potential difference is the difference is the work done by the electric force in moving a charge from point a to b. V ab =V a -V b =-W ba /q The SI unit for D V is the volt… J/C D V=PE b -Pe a =qV ba

3. 17-1 (Cont’d) See chart and diagram p 504 See Example 17-1 p505

4. 17-2 Relation Between Electric Potential and Electric Field W=qV ba 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

5. 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.

6. 17-4 The Electron-Volt …a unit of Energy 1eV= 1.6 x10 -19 J You must use the J value to calculate with KE=1/2 mv 2

7. 17-5 Electric Potential Due to Point Charges V=k Q/r = 1/(4pe 0 ) (Q/r) for a single pt. charge. See Example 17-3 p509 See Diagrams pg 509 See Example 17-4 and 17-5 p510/511

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