lecture_11_F2011

lecture_11_F2011 - Lecture 11 Chapters 24 and 25 Page 4...

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Lecture 11 Chapters 24 and 25 Page 1 Text Problem: 24 - 65 A cylindrical resistor is 5.0 mm in diameter and 1.5 cm long. It is made of a composite material whose resistivity varies from one end to the other according to the relation: L x e L x o + = 1 ρ , for L x 0 , where o = 2.14 x 10 -3 m . Calculate its resistance.
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Lecture 11 Chapters 24 and 25 Page 2 Problem The current supplied by a battery slowly decreases as the battery runs down. Suppose that the current as a function of time is hr 6 t e 75 0 I - = . in A . Calculate the total number of electrons transported from the positive electrode to the negative electrode by the charge escalator from the time the battery is first used until it is completely dead?
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Lecture 11 Chapters 24 and 25 Page 3 Fundamentals of Circuits 1. Identify Loop: 2. Identify Nodes: 3. For all but one node: 4. For as many independent loops as necessary: Sign Convention for batteries and resistors 1. Potential difference across battery: 2. Potential difference across resistors
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Unformatted text preview: Lecture 11 Chapters 24 and 25 Page 4 Multi-loop circuits Identify and label: (Resolving a circuit) 1. Identify circuit loops and nodes 2. Label the currents at each node, assigning a direction to each. The direction is arbitrary. Develop the rules: 1. For all but one node, write equations expressing Kirchoffs node law: 2. For as many independent loops as necessary, write equations expressing Kirchoffs loop law. 3. Some equations for loops and nodes are redundant, so you will not need them. Lecture 11 Chapters 24 and 25 Page 5 Problem: Find I 3 in the following circuit: Lecture 11 Chapters 24 and 25 Page 6 Capacitors in circuit with resistors: (RC circuits) Lecture 11 Chapters 24 and 25 Page 7 Charging the capacitor (assume C has no charged initially) Lecture 11 Chapters 24 and 25 Page 8 Discharging capacitor (assume C is fully charged initially)...
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lecture_11_F2011 - Lecture 11 Chapters 24 and 25 Page 4...

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