pk-ch.18-2

pk-ch.18-2 - Chapter 18 Direct Current Circuits-II So far A...

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Chapter 18 Direct Current Circuits -II

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So far A circuit consists of three-four elements: Electromotive force/power supply/battery capacitors, resistors inductors nalyzed circuits with capacitors or resistors Analyzed circuits with capacitors or resistors alone in simple parallel (potential is the same) or series combination. Parallel Series R -1 = R 1 -1 +R 2 -1 R = R 1 +R 2 C = C 1 +C 2 C -1 = C 1 -1 +C 2 -1
Some (Take a look first) examples

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y = R /R y-2 = y/(1+y) Or y 2 -2y-2 = 0 y= 1+ 3 = 2.73

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If R 1 < R 2 < R 3 , and if these resistors are connected in ries, which one dissipates the greatest power? Clicker quiz series, which one dissipates the greatest power? 1. R 1 2. R 2 3. R 3 4. all dissipate the same power
If R 1 < R 2 < R 3 , and if these resistors are connected in series, which one dissipates the greatest power? 1. R 1 2. R 2 3. R Clicker quiz 3 4. all dissipate the same power In series, the current is the same and P = I 2 R

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Gustav Kirchhoff 1824 – 1887 Invented spectroscopy with Robert Bunsen Formulated rules about radiation
Kirchhoff’s Rules There are ways in which resistors can be connected so that the circuits formed cannot be reduced to a single equivalent resistor o rules, called Kirchhoff’s Rules can be used Two rules, called Kirchhoff’s Rules can be used instead

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Statement of Kirchhoff’s Rules Junction Rule The sum of the currents entering any junction must equal the sum of the currents leaving that junction A statement of the nature of a steady state. Also conservation of arge. No pile up of charges charge. Loop Rule The sum of the potential differences across all the elements around any closed circuit loop must be zero A statement of Conservation of Energy
More About the Junction Rule I 1 = I 2 + I 3 From Conservation of Charge Diagram b shows a mechanical analog

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pk-ch.18-2 - Chapter 18 Direct Current Circuits-II So far A...

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