C H A P T E R   19 Electric Potential Energy and the Electric Potential

19.1 Potential Energy Gravitational Potential Energy

19.1 Potential Energy Gravitational Potential Energy WAB = GPEA - GPEB

19.1 Potential Energy WAB = GPEA - GPEB WAB = EPEA - EPEB

19.2 The Electric Potential Difference WAB = EPEA - EPEB

Definition of Electric Potential The electric potential V at a given point is the electric potential energy EPE of a small test charge q0 situated at that point divided by the charge itself: SI Unit of Electric Potential: joule/coulomb = volt (V)

The Electric Potential Difference WAB = EPEA - EPEB

Problem 7, Page 599 In a television picture tube, electrons strike the screen after being accelerated from rest through a potential difference of 25 000 V. The speeds of the electrons are quite large, and for accurate calculations of the speeds, the effects of special relativity must be taken into account. Ignoring such effects, find the electron speed just before the electron strikes the screen.

Electron Volt (eV) One electron volt is the amount by which the potential energy of an electron (q0 = 1.60×10-19 C) changes when the electron moves through a potential difference of one volt. It is a unit of energy. 1 eV = 1.60×10-19 J

19.3 The Electric Potential Difference Created by Point Charges

Potential of a point charge

Potential Sketch