Electronic Analogy Quiz
November 1961 Popular Electronics
It is common in electronics
courses for an analogy to be drawn between electrical and mechanical phenomena. In fact, a lot of circuit analysis
methods and equations apply directly to mechanics, and vice versa. An LC (inductor-capacitor) oscillating tank circuit
is akin to a spring and dashpot. Resistance of a wire is likened to skin friction of water flowing through a hose.
Who among us can forget those lessons? This Electronic Analogy Quiz from the November 1961 edition of Popular Electronics
presents a challenge both because some not-so-familiar examples of analogies are offered, and because some are a real
stretch. Therefore, don't feel too bad if you don't get a few. That's my way of saying that I didn't get all of them
right ;-) Answers and explanations are at the bottom of the page.
[Table of Contents]People old and young enjoy waxing nostalgic about
and learning some of the history of early electronics. Popular Electronics was published from October 1954 through April
1985. As time permits, I will be glad to scan articles for you. All copyrights (if any) are hereby acknowledged.
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Electronic Analogy Quiz
perform functions similar to many mechanical devices and natural phenomena, and finding an analogy between them often
leads to a better understanding of both. See if you can match the numbered electronic circuits on the left with the
lettered sketches on the right.
Electronic Analogy Quiz Answers
1. Low-pass filter
A low-pass filter "clips off" signals above a certain frequency; a tunnel "clips off" objects
above a certain height.
2. Zener diode regulator
D. Centrifugal governor
A zener diode "resists" changes in voltage; a governor resists changes in speed.
3. Push-pull circuit
H. Two-man saw
A signal is alternately "pushed" and "pulled" in a push-pull circuit; a two-man saw is
alternately "pushed" and "pulled" by its operators.
4. Wave trap
A. Drain trap
A wave trap removes unwanted signals; a drain trap "removes" unwanted odors.
C. Coil spring suspension
A filter "absorbs" signal "peaks" before they reach the associated circuits;
a spring "absorbs" vibration "peaks" before they reach the associated chassis.
6. Diode clipper
E. Hedge clipper
A diode clipper "clips" off "peaks" in a signal; a hedge clipper" clips" of "peaks"
in a hedge.
7. High-pass filter
A high-pass filter obstructs the passage of signals below a certain frequency; a mountain
obstructs the passage of objects below a certain height.
8. A.C. rectifier
An a.c. rectifier allows current to flow in one direction ; a ratchet-and-pawl allows
a shaft to turn in one direction.