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Understanding AC Circuits: Concepts and Problem-Solving Techniques

Dive into the world of AC circuits with this comprehensive guide covering current oscillation, reactance, impedance, and power dissipation in resistors. Test your knowledge with practice problems and feedback quizzes. Get ready for Exam 2 by reviewing essential concepts and equations.

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Understanding AC Circuits: Concepts and Problem-Solving Techniques

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  1. Class 14 PHY 232 Spring 2003 Prof. S. Billinge

  2. Announcements Exam 2 next Thursday • 50 minutes, Closed book • Bring #2 pencil, ID, calculator, 1x 8.5x11 handwritten sheet • Dr. Nagy will teach Tuesday class – will spend some time on review • Get help in helproom where possible PHY 232 Spring 2003 Prof. S. Billinge

  3. Concepts AC circuits • The magnitude and the direction of the current oscillates in time • V(t) = Vo Sin wt • Current and voltage have: • An instantaneous value • A peak value • An average value (RMS) PHY 232 Spring 2003 Prof. S. Billinge

  4. Concepts • AC circuit problems: • Resistors resist the flow of current in all circuits • In AC circuits capacitors and inductors also resist this flow • Reactance, X, is like the “resistance” of capacitors and inductors • Impedance, Z, of a circuit is defined from DVmax=ImaxZ (compare DV=IR that applies in DC circuits) • Power dissipated only in the resistor! PHY 232 Spring 2003 Prof. S. Billinge

  5. A lightbulb and a parallel plate capacitor are in series in a 115V 60Hz AC circuit. When the dielectric is removed from the capacitor The lightbulb: • Gets brighter • Gets dimmer • Stays the same brightness PHY 232 Spring 2003 Prof. S. Billinge

  6. Feedback quiz Split into groups of 2-3. Answer the following questions on paper and hand in on leaving: Exam #2 will cover homework 4-6, Chapters 18-21 (but not EM waves). • Which concepts would you like explained again in class • Which problems would you like solved again in class PHY 232 Spring 2003 Prof. S. Billinge

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