PPT-Electric Currents and Resistance II

Physics 2415 Lecture 11 Michael Fowler UVa Todays Topics First well mention capacitors Power usage kWh etc The microscopic picture Temperature dependence of resistivity Drift speed and electron speed. Physics 2415 Lecture 10. Michael Fowler, UVa. Today’s Topics. First we’ll finish capacitors. Then current electricity: frogs’ legs, etc.. The lithium ion battery. Circuits and currents: Ohm’s law. Comparing shocks from static electricity and electric currents is like comparing apples and oranges, they are similar but quite different at the same time.. Every year many people are injured and sometimes killed from electrocution as even small amounts of electric current can be lethal. . BY HEI MAN KWOK 12N03S . 5.1 electric potential difference, current and resistance. Model of electric conduction in a metal – energy transfer . Charge carriers have kinetic energy . These collide with lattice ions . ASSIGNMENT TEACHER. Smt. K.VASUMATHY. GROUP. . MEMBERS. :-. MANSI DWIVEDI . (ET 4. TH. SEM). ARTI DWIVEDI . (ET 4. TH. SEM). DIKSHA CHANDRAKAR . (ET 4. TH. SEM). MAMTA CHOUDHARY . (ET 4. TH. Electric Current. Electric current . – The net movement of electric charges in a single direction through a wire or conductor.. Voltage difference . – The force that causes electric charges to flow; charges flow from high voltage to low voltage.. Key Points. Ohm’s Law. Resistivity. Electric Power. Alternating Current. References. . 18-1,2,3,4,5,6,7. Electric current is the rate of flow of charge through a conductor:. Unit of electric current: the ampere, . Electric Current Notes. Key Terms. Voltage . produces a flow of charge, or . current. , within a conductor. . The . flow is restrained by the . resistance . it encounters. . The . rate at which energy is transferred by electric current is . Reading assignment. : Chapter . 27. Homework 27.1, due Monday, Feb. 27:. OQ1, 5, 14 . Homework 27.2, due Wednesday, March 1:. OQ3, OQ6, 15, 21, 25, 26, 31, 33, 39, 44, 48, 53. Begin . our study of charges . Comparing shocks from static electricity and electric currents is like comparing apples and oranges, they are similar but quite different at the same time.. Every year many people are injured and sometimes killed from electrocution as even small amounts of electric current can be lethal. . Static Electricity. Static Electricity-. accumulation of excess electric charges on an obj. pg. 194. Protons = + electrical charge. Electrons= - electrical charge . Example of electron transfer: . Tocitethisversion: LaurentCario,CristianVaju,Beno^tCorraze,VincentGuiot,EtienneJanod.Electric-Field-InducedResistiveSwitchinginaFamilyofMottInsulators:towardsNon-VolatileMott-RRAMMemories.Advance No Class on Wednesday March 8. Labs taught by Dr. . Mahes. on Monday and Tuesday.. No quiz on . Friday, March 10. Exam 2 on Friday, March 24, study guide posted online. Current from a battery flows steadily in one direction (direct current, DC). Current from a power plant varies sinusoidally (alternating current, AC).. Nature of science: . . Although Ohm and Barlow published their findings on the nature of electric current around the same time, little credence was given to Ohm. Barlow’s incorrect law was not initially criticized or investigated. This is a reflection of the nature of academia of the time with physics in Germany being largely non-mathematical and Barlow held in high respect in England. It indicates the need for the publication and peer review of research findings in recognized scientific journals.. NOTE: I will be plugging grades now, if you have tasks not turned in including projects, please turn them in ASAP before the end of the Second Period today.. . Those who have finished all tasks can move on to today’s tasks..