C3 - Phy sics 7B WS C3(rev 2.1 Page 1 C-3 LRC and AC...

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Physics 7B WS C3 (rev. 2.1) Page 1 C-3. LRC and AC Circuits Questions for discussion 1 . In an LC circuit 1 , why does the current oscillate? 2. In an LC circuit, the inductor stores energy in its magnetic field. Likewise, the capacitor stores energy in its electric field. How do these stored energies vary with time as the circuit oscillates? How does their sum vary with time? 3 . Adding a small resistor to an LC circuit will not change the fact that the current oscillates back and forth. But the resistor will have an important effect on things - what is it? 4. How do you expect the sum of the stored energies in the capacitor and the inductor to behave in an LRC circuit? Does this violate conservation of energy? 5 . Consider a simple AC circuit containing a resistor, a capacitor, an inductor, and a sinusoidal voltage source, all in series. a) Why does the inductor cause the amplitude of the current going through this circuit to be small when the AC frequency is very high? 1 Some problems in LC and LRC circuits require solutions to differential equations. For the results you will need, and derivations of those results, see “Differential Equations for Circuit Problems” in the Supplementary Material at the end of the workbook, in the section “LRC Equations.”
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This note was uploaded on 11/19/2010 for the course LECTURE 1 taught by Professor Yildiz during the Fall '10 term at Berkeley.

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C3 - Phy sics 7B WS C3(rev 2.1 Page 1 C-3 LRC and AC...

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