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Prozorov_08 - PHYSICS 222 Introduction to Classical Physics...

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PHYSICS 222 Introduction to Classical Physics II Prof. Ruslan Prozorov Iowa State University Fall 2011 LECTURE 8 Resistors in parallel & in series. Kirchhoff’s rules. Measuring instruments.
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electric circuits 9 September 2011 PHYS222 - Lecture 8 - Prof. Ruslan Prozorov - Iowa State University 2
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resistors in circuits Rules and assumptions Current is conserved (because charge is conserved!) Wires are ideal (no resistance) unless otherwise indicated. So two points along the same wire have the same potential, or the voltage drop across a wire is zero. A battery produces a fixed increase in potential 9 September 2011 PHYS222 - Lecture 8 - Prof. Ruslan Prozorov - Iowa State University 3
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Resistors in series Two resistors R 1 and R 2 are in series when they are connected one after the other: R 2 R 1 A B The same current flows through both: I 1 = I 2 I 9 September 2011 PHYS222 - Lecture 8 - Prof. Ruslan Prozorov - Iowa State University 4
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The same current flows through the equivalent resistor: R 2 R 1 A B I eq = I 1 = I 2 R eq A B I I equivalent resistor 9 September 2011 PHYS222 - Lecture 8 - Prof. Ruslan Prozorov - Iowa State University 5
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R 2 R 1 A B R eq A B C V 1 = V A V C V 2 = V C V B V eq = V A V B eq eq eq 1 2 1 1
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