The rise and decay of current through an in ductor - PowerPoint PPT Presentation

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The rise and decay of current through an in ductor
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The rise and decay of current through an in ductor

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  1. The rise and decay of current through an inductor

  2. End of the lessons, student should be able to ; • Explain the rise and the fall of the current versus time graph. • Formulate the related equation for rise and decay of current through an inductor. • Determine the time constant,  = L/R. • Identify its value by: • a. Graph • b. Equation • Determine the energy stored in an inductor. • Solve problems on inductors

  3. RISE AND DECAY OF INDUCTOR CURRENT

  4. Rise of inductor current : switch to a

  5. Formula for rising inductor current a. Imax = V/R b. Time constant,  = L/R c. Rising current, I = Imax (1 - e -t/ ) d. Energy stored in Inductor E = ½ LI2

  6. Decaying of inductor current : switch to b

  7. Formula for decaying inductor current a. Imax = V/R b. Time constant,  = L/R c. Decaying current, I = Imax (e -t/ )

  8. Example of Final Exam question