Lecture 9: Inductors & Capacitors Nilsson & Riedel 6.1-6.3 - PowerPoint PPT Presentation

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Lecture 9: Inductors & Capacitors Nilsson & Riedel 6.1-6.3

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  1. Lecture 9:Inductors & CapacitorsNilsson & Riedel 6.1-6.3 ENG17 (Sec. 2): Circuits I Spring 2014 April 29, 2014

  2. Overview • Inductors • Capacitors • Series-Parallel L/C

  3. Inductance in the Real World

  4. What Does an Inductor Look Like?

  5. 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

  6. 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

  7. Inductors in Circuits Symbol: L Units: [H] for henrys = [Wb/A]

  8. Determining Voltage

  9. Current in Inductor

  10. Power & Energy in Inductor

  11. Overview • Inductors • Capacitors • Series-Parallel L/C

  12. Capacitance in the Real World

  13. What Does a Capacitor Look Like?

  14. 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

  15. Capacitors in Circuits Symbol: C Units: [F] for farads = [C/V]

  16. Capacitor Voltage, Power, & Energy

  17. Example

  18. Overview • Inductors • Capacitors • Series-Parallel L/C

  19. Inductors Series-Parallel Parallel Series

  20. Capacitors Series-Parallel Parallel Series

  21. Recap • Inductors • Capacitors • Series-Parallel L/C