PHYS 0175 1st Edition Lecture 19Outline of Last Lecture II. Ohmic vs non OhmicIII. Two conducting wires of same materialIV. Wire 1 converted into wire 2V. Resistors in seriesVI. resistors in ||VII. Bridge suspension with cable VIII.Power inputIX. Power dissipated by resistorsCurrent LectureX. Dependence of CurrentXI. EmfXII. Junction and loop rulesII. Sign conventionsXIII. resistors in ||XIV.Bridge suspension with cable XV. Power inputXVI.Power dissipated by resistorsCurrent LectureIII. Dependence of Currenta. Only in series(single loop)b. Not if ||(multiloops)c. Decide if do Req for || or series 1st to simplifyIV. Emfa. Not real forceb. Same as batter/potential differencec. Real batteries have internal resistanceV. Junction and loop rules(Kirchoff’s)a. Loop rule: must be closed loopi. Sum of potential drops and rises=0ii. Conservation of energyb. Junction rulei. Sume of currents=0ii. Conservation of chargeiii. Branchesiv. Current inot a vector VI. Sign conventionsa. Emf>0 if from lower to higherb. Emf<0 higher to lower(voltage drop)c. V=RI<0 if higher to lowerd. Ri>0 if lower to highere. if 2 opposing currents, will go in the direction of the stronger(larger) currentf. if unknown, if turns out to be <0 must switch
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