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LCR Circuits Quiz
November 1969 Electronics World

November 1969 Electronics World

November 1969 Electronics World Cover - RF Cafe  Table of Contents 

Wax nostalgic about and learn from the history of early electronics. See articles from Electronics World, published May 1959 - December 1971. All copyrights hereby acknowledged.

After learning the fundaments of Ohm's law, for calculating simple relationships between voltage, current, power, and resistance, the next area of study is capacitors and inductors. Anyone who might have had trouble grasping the concepts of Ohm's law will certainly be considering another career line when encountering these two components. Fortunately, an introductory course does not immediately deal with complex math -- involving real and imaginary parts. Rather tidy equations relating common combinations of L's (inductors), R's (resistors), and C's (capacitors) are taught to enable calculations of voltage and current phase relationships when applied to any combination of the three components -- in series, in parallel, or in a mix of the two. For your convenience, I have tabulated all of those common LCR combinations here, and my RF Cafe Espresso Workbook has a worksheet devoted to doing the calculations for you. You're welcome.

 

LCR Circuits Quiz

LCR Circuits Quiz, November 1969 Electronics World - RF CafeBy Robert P. Balin

The seven circuits shown to the right are frequency sensitive: as the frequency of the input voltage changes, the a.c. current indicated on each ammeter not only changes in value, but its cycles may lead or lag those of the input voltage. To test your knowledge of a.c. circuit t behavior, try to match the seven circuits (A-C) with the descriptive statements (1-20) given below. One or two circuits may fit each statement.

1. At the resonant frequency, the current drops to its minimum value.

2. As the frequency increases, the current always decreases.

3. Below the resonant frequency, the current leads the input voltage.

4. As the frequency is increased, the leading power factor increases.

5. Above the resonant frequency, the current lags the input voltage.

6. As the frequency decreases, the current always increases.

7. At the resonant frequency, this circuit is purely resistive.

8. The current always leads the input voltage by 90 degrees.

9. At the resonant frequency, this circuit behaves like a short circuit.

10. As the frequency is decreased, the lagging power factor increases.

11. Below the resonant frequency, the current lags the input voltage.

12. As the frequency decreases, the current always decreases.

13. At the resonant frequency, the current is in-phase with the input voltage.

14. As the frequency is decreased, the leading power factor decreases.

15. Above the resonant frequency, the current leads the input voltage.

16. As the frequency increases, the current always increases.

17. At the resonant frequency, the current reaches its maximum value.

18. The current always lags the input voltage by 90 degrees.

19. As the frequency is increased, the lagging power factor decreases.

20. At the resonant frequency, this circuit behaves like an open circuit.

Quizzes from vintage electronics magazines such as Popular Electronics, Electronics-World, QST, Radio-Electronics, and Radio News were published over the years - some really simple and others not so simple. Robert P. Balin created most of the quizzes for Popular Electronics. This is a listing of all I have posted thus far.

RF Cafe Quizzes

Vintage Electronics Magazine Quizzes

Vintage Electronics Magazine Quizzes

 

LCR Circuits Quiz Answers

LCR Circuits Quiz Answers, November 1969 Electronics World - RF Cafe
Windfreak Technologies Frequency Synthesizers - RF Cafe

About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2025
Webmaster: Kirt Blattenberger,
   BSEE - KB3UON - AMA92498
   USAF Radar Technician

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived...

Copyright  1996 - 2026

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