P219lecture07Kirchoffs - Goal To understand how to solve...

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Goal: To understand how to solve circuits with multiple power sources Objectives: 1) To learn Kirchhoff’s Laws 2) To use those laws in order to play Physics Chutes & Ladders
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Suppose we have the following circuit: I1 10 V 5 Ohms 2 Ohms 3 Ohms I2
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Kirchhoff’s Laws You have already learned them! Law 1: The current going into a point must be the current going out of the point. So Iin = Iout Law 2: If you do a full loop, the net change in voltage is 0. We can use this to our advantage!
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At the cross points, Iin = Iout I1 10 V 5 Ohms 2 Ohms 3 Ohms I2
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If we do any loops then the net voltage is 0. That is the up voltage = the down voltage I1 10 V 5 Ohms 2 Ohms 3 Ohms I2 8 Ohms 6 Ohms 5 V I3
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Physics Chutes and Ladders When you look at a circuit, first plot the potential raises and drops. In the direction of the current for each section, the voltages for from low (-) to high (+) potentials. Resistors go from + to – What direction should the current go? Well don’t worry about it. If you choose wrong you will just get a negative current, and the is okay. Just be consistant.
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