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Understanding Inductance: Principles, Units, and Applications

Learn the principles of inductance, units of inductance, different types of inductors, total inductance in circuits, and L/R time constants. Understand how inductance allows for energy storage in a magnetic field and explore the various types of inductors and their classifications. Master the calculation of total inductance in series and parallel circuits, as well as the time constant formula. Enhance your knowledge of inductance with practical examples and illustrations.

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Understanding Inductance: Principles, Units, and Applications

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  1. Chapter 10 Inductance

  2. Objectives • After completing this chapter, you will be able to: • Explain the principles of inductance • Identify the basic units of inductance • Identify different types of inductors • Determine the total inductance in series and parallel circuits • Explain L/R time constants and how they relate to inductance

  3. Inductance • Inductance • Ability to store energy in a magnetic field • Represented by the letter L • henry (H) • Unit for measuring inductance

  4. Inductors • Inductors • Designed to have a specific inductance • Classified by the type of core material • Magnetic or nonmagnetic • Can be fixed or variable

  5. Inductors (cont’d.) Figure 10-4. An air-core inductor.

  6. Inductors (cont’d.) Figure 10-6. Toroid-core inductor.

  7. Inductors (cont’d.) Figure 10-7. Shielded inductor.

  8. Inductors (cont’d.) Figure 10-8. Laminated iron-core inductor.

  9. Inductors (cont’d.) • Total inductance in series circuits: • Total inductance in parallel circuits:

  10. L/R Time Constants Figure 10-9. Circuit used to determine L/R time constant.

  11. L/R Time Constants (cont’d.) • Time constant formula: t = L/R where: t = time in seconds L = inductance in henries R = resistance in ohms

  12. Figure 10-10. Time constants required to build up or collapse the magnetic field in an inductor.

  13. Summary • Inductance (L) is the ability to store energy in a magnetic field • Unit for measuring inductance is the henry (H) • Types of inductors include: air-core, ferrite or powdered iron core, toroid core, shielded, and laminated-iron core

  14. Summary (cont’d.) • Total inductance in series circuits: • Total inductance in parallel circuits: • Time constant formula: t = L/R

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