TAILIEUCHUNG - Electric Circuits, 9th Edition P11

Electric Circuits, 9th Edition P11. 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. | 76 Simple Resistive Circuits Summary Series resistors can be combined to obtain a single equivalent resistance according to the equation k eq 2 - Rk- i See page 58. collection of series-connected resistances when the voltage drop across the collection is known vj Ri Parallel resistors can be combined to obtain a single equivalent resistance according to the equation where Vj is the voltage drop across the resistance Rj and v is the voltage drop across the series-connected resistances whose equivalent resistance is 7 eq. See page 65. 1 eq Ri R1 Ri x Rk When just two resistors are in parallel the equation for equivalent resistance can be simplified to give n R R1 eq 7 2 See pages 59-60. When voltage is divided between series resistors as shown in the figure the voltage across each resistor can be found according to the equations Ra V Ri V2 ---- U-. R2 See page 61. R2 When current is divided between parallel resistors as shown in the figure the current through each resistor can be found according to the equations R2 Rx R2 i 2 R R2 - See page 63. Voltage division is a circuit analysis tool that is used to find the voltage drop across a single resistance from a Current division is a circuit analysis tool that is used to find the current through a single resistance from a collection of parallel-connected resistances when the current into the collection is known Req where ij is the current through the resistance Rj and i is the current into the parallel-connected resistances whose equivalent resistance is 7 eq. See page 65. A voltmeter measures voltage and must be placed in parallel with the voltage being measured. An ideal voltmeter has infinite internal resistance and thus does not alter the voltage being measured. See page 66. An ammeter measures current and must be placed in series with the current being measured. An ideal ammeter has zero internal resistance and thus does not alter the current being measured. See page 66. Digital meters and analog meters have .

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