RC AND L/R TIME CONSTANTS

Chapter 16 RC AND L/R TIME CONSTANTS

Lessons In Electric Circuits Volume I – DC Book
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Lessons In Electric Circuits Volume I – DC Book

  • Chapter 16RC AND L/R TIME CONSTANTSContents 511,16.1 511,Electrical 511,transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501 511,16.2 511,Capacitor 511,transient 511,response . . . . . . . . . . . . . . . . . . . . . . . . . . . 501 514,16.3 514,Inductor 514,transient 514,response . . . . . . . . . . . . . . . . . . . . . . . . . . . . 504 517,16.4 517,Voltage 517,and 517,current 517,calculations . . . . . . . . . . . . . . . . . . . . . . . . . 507 523,16.5 523,Why 523,L/R 523,and 523,not 523,LR?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 513 526,16.6 526,Complex 526,voltage 526,and 526,current 526,calculations . . . . . . . . . . . . . . . . . . . 516 527,16.7 527,Complex 527,circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 517 532,16.8 532,Solving 532,for 532,unknown 532,time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 522 534,16.9 534,Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52416.1Electrical transientsThis chapter explores the response of capacitors and inductors to sudden changes in DC volt-age (called a transientvoltage), when wired in series with a resistor. Unlike resistors, whichrespond instantaneously to applied voltage, capacitors and inductors react over time as theyabsorb and release energy.16.2Capacitor transient responseBecause capacitors store energy in the form of an electric field, they tend to act like smallsecondary-cell batteries, being able to store and release electrical energy. A fully dischargedcapacitor maintains zero volts across its terminals, and a charged capacitor maintains a steadyquantity of voltage across its terminals, just like a battery. When capacitors are placed in acircuit with other sources of voltage, they will absorb energy from those sources, just as asecondary-cell battery will become charged as a result of being connected to a generator. A fully501