Phys 115 1st Edition Lecture 9Outline of Last Lecture I. Guest PresentationII. Electric potential of a point chargeOutline of Current Lecture III. Complete circuitsa. Conductors and insulatorsb. Circuit diagramsIV. Current and ResistanceCurrent Lecture- Electrical currentso You can’t see these- Proportionalityo Brightness is an indicator of flow- CR3o A>C=Bo Equal brightness have equal currentso Current through battery 1 is greater than batter 2o B=C because the same current is running through them- Resistanceo Adding more bulbs increases resistanceo Resistance increases, current decreaseso Third rule of our modelo When a bulb is added in series to a circuit, the total resistance of the circuit increases, and the current through the battery increases. o If a bulb which is connected in series is removed from a circuit, the total resistance of the circuit decreases, and the current through the battery increases.- Kirchhoff’s Junction Lawo The splitting and combining of current in a parallel circuit is a consequence of conservation of charge.o Kirchhoff’s Junction Law states that the sum of the currents into a junction equals the sum of the currents leaving.o Fourth rule of our model- Bulbs in parallelo Brightness is equal IF same circuitThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.o Brightness equal in parallelo Current iD = iE = iAo Fifth rule of our modelo When a bulb is added in parallel to a circuit, the total resistance of the circuit decreases, and the total current through the battery increases.o When a bulb connected in parallel is removed from a circuit, the total resistance of the circuit increases, and the total current through the battery
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