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.
- Test Your
Knowledge of Semiconductors, August 1972
- Ganged Switching Quiz,
- Lamp Brightness Quiz,
Lissajous Pattern Quiz, September 1963
Quizoo, October 1962
Photo Album Quiz, March 1963
Alphabet Quiz, May 1963
- Quiz: Resistive?
Inductive? or Capacitive?, October 1960
Vector-Circuit Matching Quiz, June 1970
Quiz, September 1961
- RC Circuit Quiz,
- Diode Quiz, July
Curves Quiz, February 1963
Electronic Numbers Quiz, December 1962
Conversion Quiz, April 1963
- Coil Function
Quiz, June 1962
Analogy Quiz, August 1960
- Audio Quiz,
Unit Quiz, May 1962
Circuit Quiz, June 1968
on AC Circuit Theory, December 1970
Magnetic Phenomena Quiz, February 1962
Electronics Geography Quiz, April 1970
Menu Quiz, August 1963
Noise Quiz, August 1962
Current Quiz, October 1963
- Electronic Inventors Quiz, November 1963
Function Quiz, January 1962
Measurement Quiz, January 1963
- Vacuum 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