Phys2212_30.5+to+31.4

# Phys2212_30.5+to+31.4 - Physics 2212 Electricity and...

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Physics 2212 Electricity and Magnetism Lecture 14 DC Circuits and Power

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Physics 2212 - Lecture 14 These are some of the symbols we will use to represent objects in circuit diagrams. Variable elements are indicated by adding an arrow. Other symbols: inductance, transformer, diode, transistor, ammeter, etc. A
Physics 2212 - Lecture 14 A Circuit Diagram Actual Circuit Circuit Diagram

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Physics 2212 - Lecture 14 Kirchhoff’s Laws
Physics 2212 - Lecture 14 Basic Circuit loop bat R ( ) 0 i i V V V V = = ∆ + ∆ = bat R downstream upstream ; V V V V IR = + = - = - E 0; IR I R - = = E E

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Physics 2212 - Lecture 14 Plumber’s Analogy* P 1 P 2 Pump Constriction I I High pressure Low pressure The “plumber’s analogy” of this circuit is a pump (=battery) pumping water in a closed loop of pipe that includes a constriction (=resistor). The pressure (=V 1 ) is the upper part of the loop is higher than in the lower part (=V 2 ). There is a pressure drop (=V 1 -V 2 ) across the constriction and a pressure rise across the pump. The water flow I is the same at all points around the loop. I I V 1 V 2 Pump = Battery Constriction = Resistor Pressure = Potential Water Flow =Current
Physics 2212 - Lecture 14 Example: A Single-Resistor Circuit (1.5 V) 0.10 A (15 ) I R = = = E bat R 1.5 V; 1.5 V V V = = = - = - E E

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## This note was uploaded on 06/07/2009 for the course PHYSICS 2212 taught by Professor Geist during the Fall '09 term at Georgia Perimeter.

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Phys2212_30.5+to+31.4 - Physics 2212 Electricity and...

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