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# 16 - 13-Jun-11-6:45 PM Inductors Caps Switches EEL 3111...

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13-Jun-11---6:45 PM Inductors, Caps, Switches 1 University of Florida, EEL 3111 – File # 16 © Dr. Eric M. Schwartz EEL 3111: Circuits 1 Today’s Menu Inductors > Faraday’s Laws > Inductors in Series & in Parallel > Inductor Energy Capacitors Today’s Class . .. University of Florida, EEL 3111 –File # 16 © Dr. Eric M. Schwartz 1 > Capacitors in Series & in Parallel > Capacitor Energy Circuits with switches See examples on web-site: Inductor0, Inductor1, Capacitor0, Switch1 EEL 3111: Circuits 1 Inductors An inductor is usually thought of as a coiled wire around a “core”, but a straight wire has also inductance Usually inductance is bad so we try to avoid using inductors Most electric circuits do NOT have inductors University of Florida, EEL 3111 –File # 16 © Dr. Eric M. Schwartz 2 Circuit Diagram Symbol •Unit symbol •is H Inductance is measured in Henrys Quantity Symbol PSpice component name: L

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13-Jun-11---6:45 PM Inductors, Caps, Switches 2 University of Florida, EEL 3111 – File # 16 © Dr. Eric M. Schwartz EEL 3111: Circuits 1 How does an inductor work Inductors + v (t) - How does an inductor work? dt di L v (with PSC) + v (t) - i (t) i (t) University of Florida, EEL 3111 –File # 16 © Dr. Eric M. Schwartz 3 dt di L v (without PSC) - v (t) + i (t) EEL 3111: Circuits 1 Faraday’s Law d d N v Faraday’s Law: where is the flux and N is number of turns of wire dt i N proportional to Li N t d v t i ) ( 1 ) ( di L v dt di dt d L N v University of Florida, EEL 3111 –File # 16 © Dr. Eric M. Schwartz 4 Q: If current is 3A when L = 2H, what is the voltage? A: Don’t know! Knowing i at a particular time is not enough information ! L dt
13-Jun-11---6:45 PM Inductors, Caps, Switches 3 University of Florida, EEL 3111 – File # 16 © Dr. Eric M. Schwartz EEL 3111: Circuits 1 Inductor Features >Suppose is a constant What is dt di L v >Suppose i is a constant. What is v ? V 0 dt di L v L 0 dt di An inducto is a short circuit to DC University of Florida, EEL 3111 –File # 16 © Dr. Eric M. Schwartz 5 An inductor is a EEL 3111: Circuits 1 Inductor i(t) vs v(t) Example 12 i (A) + v (t) - > What is a graph of v L for t > 0? t (sec) 10 15 19 v (V) d i (t) University of Florida, EEL 3111 –File # 16 © Dr. Eric M. Schwartz 6 10 12 2 V 4 . 2 4 12 2 V 6 2.4 t (sec) 10 15 19 dt di L v

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13-Jun-11---6:45 PM Inductors, Caps, Switches 4 University of Florida, EEL 3111 – File # 16 © Dr. Eric M. Schwartz EEL 3111: Circuits 1 Inductor i(t) vs v(t) Example i (A) di 12 t (sec) 10 dt L v v (V) + v (t) - i (t) University of Florida, EEL 3111 –File # 16 © Dr. Eric M. Schwartz 7 V = - ?
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16 - 13-Jun-11-6:45 PM Inductors Caps Switches EEL 3111...

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