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Electric Circuits 8th Edition 72

# Electric Circuits 8th Edition 72 - by a n = i R p = i z R u...

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4S Circuit Etements if the current flow in the resistor is in the directiol of the voltage drcp across it, or through connecting elementq starting and ending at the same node and encountering intermediate nodes o y once each. (See pages 36 38.) fhe voltages and cullenfs of interconnected circuit ele- ments obey Kirchhoffs laws: . I(irchhoffs current law states that the algebraic sum of all the currents at any node in a circuit equals zero. (See page 36.) . KirchhofPs voltage law states that the algebraic sum of all the voltages aiound any closed path in a circuit equals zero. (See page 37.) A circuit is solved when the voltageacross and the cur rent in every elementhave been detemined. By com- bining an undentanding of independent and dependent sources, Ohm's laq and Kirchhoff's laws, we can solve many simple circuits. 12.27) if the curent flow in the resistor is in the direction of the voltage dse aooss it. (See page 29.) By combidng the equation for power, p : ot, with Ohm's law,we can determine tle power absorbed
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Unformatted text preview: by a n = - i R p = i z R - u z l R . (2.28) (See page 30.) . Circuits are described by nodes and closed paths. A node is a point where two or more circuit elementsjoin. When just two elements connect to form a node, t]!ey are said to be in seri€s. A clos€d path is a loop traced Problems Section 2.1 2.1 a) Is the interconnection of ideal sources in the cir-figlre P2.2 cuil in Fig. P2.1valid? Explain. b) Idenrify which sources aie developing and which sources are absorbing power. c) Verify that the total power developed in cuit equals the total power absorbed. d) Repeat (a)-(c), reversing the polarity 10V source. figure P2.1 If the interconnection ir Fig. P2.3 is valid, find rhe total power developed bythe voltage sources.If the interconnection is not valid, explain why. Figure P2,3 the cir-of the 2.3 3 0 v rhe the Tf rhe inlerconneclion in Fig. P2.2 is valid. find power developed by the current sources. If interconnection is not valid, explain why. 10v 2.2 10v...
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