Physics 2213
Homework #11
Spring 2009
Read:
Chapter 30, sections 30.5 (30.6 for conceptual understanding);
Chapter 31, all
Learning Goals:
(Be sure you understand where and how each goal in each assignment applies to our
homework, discussion, lecture, and lab activities.)
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Explain how a basic LC circuit works, and calculate values of electric charges, voltages,
currents, and energies in such a circuit.
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Sketch graphs of electric charges, voltages, currents, and energies as functions of time in a
free-running series LC, LR, or LCR circuit, and identify equations that describe these graphs.
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Explain what AC (alternating current is), and draw graphs of currents, voltages, and
power in AC circuits.
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Relate the maximum and rms values of currents and voltages in AC circuits, and calculate
average power using maximum and rms voltages and currents.
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Use the Method of Phasors to illustrate how an AC driven series LC, LR, RC, or LCR circuit
works and how its voltages and currents are related, including phase shifts.
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Explain what reactance and impedance are, and use them to relate and calculate current and
voltage amplitudes and phases in AC circuits.
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Explain how an electrical transformer works and its role in electric power delivery.