August 1960 Popular Electronics
Wax nostalgic about and learn from the history of early electronics. See articles
published October 1954 - April 1985. All copyrights are hereby acknowledged.
This electronics analogy quiz is a little easier than a few
of the others published in Popular Electronics because
all of the electrical and mechanical objects depicted here are
very familiar. The concepts might seem trivial to those of us
who have been immersed in the science for decades, but I for
one can remember when first hearing these analogies how helpful
they were. Not only that, but I also recall during physics and
mechanics courses in college being amazed at the similarity
of equations shared by electrical and mechanical processes.
Electronic Analogy Quiz
By Robert P. Balin
Analogies - or comparisons - between electrical and mechanical
phenomena are widely used to explain many electronic principles.
See if you can match the lettered objects to the numbered symbols
in the boxes below. The correct match in each case, and a complete
explanation of the principles involved, will be found at the
bottom of the page.
Popular Electronics published many quizzes over the years
- some really simple and others not so simple. Robert Balin created many of the quizzes.
This is a listing of all I have posted thus far.
- Diagram Quiz, August
- TV Trouble Quiz,
- Electronics History Quiz,
- Scope-Trace Quiz,
March 1965 Popular Electronics
Circuit Analogy Quiz, April 1973
Your Knowledge of Semiconductors, August 1972
- Ganged Switching
Quiz, April 1972
- Lamp Brightness
Quiz, January 1969
- Lissajous Pattern Quiz, September 1963
Quizoo, October 1962
- Electronic Photo Album Quiz, March 1963
- Electronic Alphabet Quiz, May 1963
- Quiz: Resistive?
Inductive? or Capacitive?, October 1960
- Vector-Circuit Matching Quiz, June 1970
Quiz, September 1961
- RC Circuit
Quiz, June 1963
- Diode Quiz,
- Electronic Curves Quiz, February 1963
- Electronic Numbers Quiz, December 1962
- Energy Conversion Quiz, April 1963
Function Quiz, June 1962
Factor Quiz, November 1966
Math Quiz, November 1965
- Series Circuit Quiz,
Electrochemistry Quiz, March 1966
- Electronic Analogy
Quiz, November 1961
Coupling Quiz, August 1973
- Electronics Analogy Quiz, August 1960
- Audio Quiz,
Unit Quiz, May 1962
Capacitor Circuit Quiz, June 1968
- Quiz on AC Circuit Theory, December 1970
- Magnetic Phenomena Quiz, February 1962
- Electronics Geography Quiz, April 1970
Electronic Menu Quiz, August 1963
- Electronic Noise Quiz, August 1962
- Electronic Current Quiz, October 1963
- Electronic Inventors Quiz, November 1963
Function Quiz, January 1962
- Electronic Measurement Quiz, January 1963
Tube Quiz, February 1961
- Kool-Keeping Kwiz, June
Analogy Quiz Answers
I. G. Because of its magnetic field, an inductor has the
ability to resist any change in the amount or direction of the
current flowing through it - we call this property "electrical
inertia." A heavy grinding wheel, because of its mass, has mechanical
inertia and tends to resist any change in its speed or direction
2. D. A rectifier in an electrical circuit permits electron
flow in only one direction. A ratchet wheel and check pawl likewise
permit rotation in only one direction.
3. C. A capacitor stores electrical energy in its dielectric
when it is charged, and the energy is recovered when you provide
a discharge path for it. The coil spring in a jack-in-the-box
stores mechanical energy in its stressed turns when the spring
is compressed; this energy is recovered when you open the box.
4. H. A fuse element can carry little more than the normal
current for its circuit; when an overload occurs, it is the
first thing to burn in two and thereby open the circuit. The
fuse may be compared, then, to the weakest link in a chain.
5. B. A resonant circuit will oscillate at a frequency determined
by the inductance and capacitance present. A tuning fork oscillates
as well, but at a frequency determined by its mechanical construction.
6. A. A transformer takes electrical energy supplied to its
primary winding as a large current at low voltage and provides
us with virtually the same amount of energy delivered as a small
current at high voltage from its secondary winding. A gear train
receives mechanical energy at high speed and low torque and
converts it for use by a device requiring the same amount of
power supplied at low speed and high torque.
7. E. An open switch stops electron flow in the same manner
as a closed faucet stops the flow of water.
8. F. A resistor limits the current in a circuit, but converts
some of the electrical energy into heat while doing so. The
brake shoe on the wagon wheel limits the speed of its rotation,
and changes some of the mechanical energy into heat.
Posted November 18, 2013