L14_Viet_DC Circuits and Power

L14_Viet_DC Circuits and Power - Physics 122 Electricity...

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Unformatted text preview: Physics 122 Electricity and Magnetism Lectur e 14 DC Cir cuits and Power 05/13/09 Physics 122 - Lecture 14 2 Cir cuit Elements & Diagr ams 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 05/13/09 Physics 122 - Lecture 14 3 A Cir cuit Diagr am Actual Circuit Circuit Diagram 05/13/09 Physics 122 - Lecture 14 4 Kir chhoff’s Laws 05/13/09 Physics 122 - Lecture 14 5 Basic Cir cuit loop bat R ( ) i i V V V V ∆ = ∆ = ∆ + ∆ = bat R downstream upstream ; V V V V IR ∆ = + ∆ =- = - E 0; IR I R- = = E E 05/13/09 Physics 122 - Lecture 14 6 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 (=P 1 ) is the upper part of the loop is higher than in the lower part (=P 2 ). There is a pressure drop (=P 1-P 2 ) across the constriction and a pressure rise across the pump. The water flow I is the same at all points around the loop....
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L14_Viet_DC Circuits and Power - Physics 122 Electricity...

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