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Chapter 10

Chapter 10. Inductance. 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

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Chapter 10

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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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