tailieunhanh - Electric Circuits, 9th Edition P8

Electric Circuits, 9th Edition P8. Designed for use in a one or two-semester Introductory Circuit Analysis or Circuit Theory Course taught in Electrical or Computer Engineering Departments. Electric Circuits 9/e is the most widely used introductory circuits textbook of the past 25 years. As this book has evolved over the years to meet the changing learning styles of students, importantly, the underlying teaching approaches and philosophies remain unchanged. | 46 Circuit Elements assessment problems Objective 3 Know how to calculate power for each element in a simple circuit For the circuit shown find a the current iY in microamperes b the voltage v in volts c the total power generated and d the total power absorbed. Answer a 25 A b -2 V c 6150 xW d 6150 W. The current i b in the circuit shown is 2 A. Calculate a vs b the power absorbed by the independent voltage source NOTE Also try Chapter Problems and . c the power delivered by the independent current source d the power delivered by the controlled current source e the total power dissipated in the two resistors. Answer a 70 V b 210 W c 300 W d 40 W e 130 W. Practical Perspective Electrical Safety At the beginning of this chapter we said that current through the body can cause injury. Let s examine this aspect of electrical safety. You might think that electrical injury is due to burns. However that is not the case. The most common electrical injury is to the nervous system. Nerves use electrochemical signals and electric currents can disrupt those signals. When the current path includes only skeletal muscles the effects can include temporary paralysis cessation of nervous signals or involuntary muscle contractions which are generally not life threatening. However when the current path includes nerves and muscles that control the supply of oxygen to the brain the problem is much more serious. Temporary paralysis of these muscles can stop a person from breathing and a sudden muscle contraction can disrupt the signals that regulate heartbeat. The result is a halt in the flow of oxygenated blood to the brain causing death in a few Summary 47 minutes unless emergency aid is given immediately. Table shows a range of physiological reactions to various current levels. The numbers in this table are approximate they are obtained from an analysis of accidents because obviously it is not ethical to perform electrical experiments on people. Good electrical .

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