PHYS 0175 1st Edition Lecture 20Outline of Last Lecture II. Dependence of CurrentIII. EmfIV. Junction and loop rulesII. Sign conventionsV. resistors in ||VI. Bridge suspension with cable VII. Power inputVIII.Power dissipated by resistorsCurrent LectureIX. Junction and loop rulesIII. Sign conventionsIV. thermal energy dissipationV. RC circuitCurrent LectureVI. 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 VII. 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 directiong. will become system of equationsVIII.thermal energy dissipationa. P=Ri^2IX. RC circuita. Resistor in series to slow down charging of capacitorb. Larger resistor=slower chargingc. 1st order differential equationd. charge is a function of time dq/dt=ie.
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