unit8-ohms-law

Ohm’slaw在同一电路中，导体中的电流跟导体两端的电压成正比，跟导体的电阻成反比,这就是欧姆定律.欧姆定律公式：I=U/RFastreading•Answerthefollowingquestionsaccordingtothetext.1.WhowasOhm?2.WhatcontributiondidOhmmakeinphysics?3.CanyoutellOhm’sLawinEnglish?4.Whatispotentialdifference?5.Howdoyoucalculatevoltageinacircuit?6.Howdoyoucalculateresistanceinacircuit?CarefulreadingParagraph1GeorgSimonOhm(1787-1854)AGermanphysicistElectricalcurrentsTheunitofelectricalresistanceFormulationoftherelationshipbetweencurrent,electromotiveforceandresistanceparagraph2ElectriccircuitAcontinuouspathConductorsConductingdevicesAsourceofpowerNotcontinuous(aclosedcircuit)(anopencircuit)Paragraph3,4•Thecurrentflowingthrougharesistorisdirectlyproportionaltothepotentialdifferenceacrossitsendsprovidingthetemperatureremainsconstant.R=V/I(resistance=voltage/current)TheconductorbetweenthetwolocationsThepotentialdifferenceTheamountofcurrent(DC,AC)Example•Ifacurrentof2amperesflowsthroughthecircuitwhichhasaresistorof10ohms,andtheresistanceofthewireusedinthecircuitis6ohms,calculatethevoltageorthepotentialdifferenceacrossthecircuit.•R=R1+R2=10Ω+6Ω=16Ω•V=IXR=2X16=32VSumupOhm’sLawresistance=voltage/current