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Class 14

Class 14. 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. Concepts. AC circuits

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Class 14

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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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