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Lecture 9: Inductors & Capacitors Nilsson & Riedel 6.1-6.3. ENG17 (Sec. 2): Circuits I Spring 2014. April 29, 2014. Overview. Inductors Capacitors Series-Parallel L/C. Inductance in the Real World. What Does an Inductor Look Like?. What Does an Inductor Do?.
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Lecture 9:Inductors & CapacitorsNilsson & Riedel 6.1-6.3 ENG17 (Sec. 2): Circuits I Spring 2014 April 29, 2014
Overview • Inductors • Capacitors • Series-Parallel L/C
What Does an Inductor Do? • Inductor: electrical component that opposes any change in electrical current • Associates electrical current and magnetic fields • Magnetic field generated by charge in motion(i.e., current) • If current changes wrt time, mag field changes wrt time • Varying mag field results in voltage in linked conductor
Add’l Note • Inductors can store energy through the mag fields • Used in spark plugs • Inductors do not generate energy, so they are still passive devices
Inductors in Circuits Symbol: L Units: [H] for henrys = [Wb/A]
Overview • Inductors • Capacitors • Series-Parallel L/C
What Does a Capacitor Do? • Capacitor: electrical component that consists of 2 conductors separated by dielectric • “Stores” electric charge (like a battery) • Associated with electric fields, due to separation of charge (voltage) • If voltage varies with time, E-field varies with time • Varying E-field generates displacement current in space occupied by field • Capacitance relates displacement current to voltage
Capacitors in Circuits Symbol: C Units: [F] for farads = [C/V]
Overview • Inductors • Capacitors • Series-Parallel L/C
Inductors Series-Parallel Parallel Series
Capacitors Series-Parallel Parallel Series
Recap • Inductors • Capacitors • Series-Parallel L/C