Ch2 - < TS 2-7 QUESTIONS AND PROBLEMS 1 Calculate the...

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Unformatted text preview: :< TS 2-7 QUESTIONS AND PROBLEMS 1. Calculate the effective capacitance of the circuit shown in Figure A. 1.0uF °——| 10 uF 2.7 uF FIGURE A Circuit for problem 1. a 2. Calculate the effective capacitance of the circuit shown in Figure B. 2.7 uF 2.7 up °————I|——| 100 11F 10 tn: FIGURE B Circuit for problem 2. z 3. Sketch vout vs. time for the circuit shown in Figure C _ after the switch is closed. R = 100 kg Switch vont V=12V C=10uF FIGURE C Circuit for problems 3, 4 and 5. Chapter 2 Capacitors & Inductors 41 4. Given that the tolerance for the resistor is i 5% and that for the capacitor is — 20% to + 80%, what would be the minimum and maximum values of vout you would expect from the circuit of Figure C after a time of 1.0 second? 5. An RC circuit is needed with a time constant of 1.000 second. Explain why the circuit shown in Figure C is a poor circuit if the capacitor is electrolytic. 6. A designer wishes to replace the circuit shown in Figure D with an RC circuit that has the same voltage vs. time char- acteristics. Design an acceptable RC circuit. FIGURE D Circuit for problem 6. 7. In the circuit shown in Figure E, describe the current that flows from the battery to point A after the switch is closed. In what direction does it flow and what is its value? Switch FIGURE E Circuit for problem 7. 8. A timing circuit may use the RC charging time to con- trol a subsequent stage, as in Figure F. With R = 1 MD, What value of C is needed so that vc equals 70 V at 10.0 sec- onds after the switch closes? 9. If the subsequent stage referred to in problem 8 has an effective resistance to ground of 10 k0, how long after the 42 Chapter 2 Capacitors & Inductors switch is reopened will it take to discharge C from full + 100 V charge to 1 V under the conditions stated in problem 8? 10. An electromagnet is operated at 50 A. Assuming an inductance of 100 H for the magnet’s coil, what voltage will be developed when the switch is opened? When it is closed? Assume that the switch requires 1 millisecond to Subsequent operate. stage FIGURE F Circuit for problems 8 and 9. ...
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