May 1966 Popular Electronics
Table of Contents
Wax nostalgic about and learn from the history of early electronics. See articles
from
Popular Electronics,
published October 1954 - April 1985. All copyrights are hereby acknowledged.
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The circuit drawings in this Series
Circuit Quiz are a little hard to read in a few places because the original page used
light red on top of a gray background. The magic of image processing did a pretty good
job of cleaning them up to where you shouldn't have any trouble reading them. This quiz
from Robert Balin appeared in the April 1966 issue of Popular Electronics. It
is one of the easier, so don't tell anyone if you score less than 100% ;-)
Series Circuit Quiz
By Robert P. Balin
Experimenters often have to connect similar electronic components - resistors, capacitors,
coils, etc. - in series to obtain a desired value or effect. This deceptively simple
task requires an understanding of the basic operating principles of the components. See
how many of these True /·False questions you can answer correctly by first working out
each problem.
1. If two capacitors are connected in series
across a voltage source, the smaller one will charge up to the larger proportion of the
applied voltage.
True _
False _
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6. If two voltmeters, each set on the same
scale, are in series across a voltage source, the one with the higher ohms/volt rating
gives the greater deflection.
True _
False _
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2. If two lamps of equal voltage and wattage
rating are connected in series across a power source, each will deliver one-half of its
rated power.
True _
False _
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7. If the filaments of a 6V6 and a 12SQ7
electron tube are wired in series, the tubes will operate satisfactorily when connected
across an 18-volt source.
True _
False _
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3. If two s.p.s.t. switches are connected
in series with a battery and a lamp. the arrangement may be considered the same as an
"OR" logic circuit.
True _
False _
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8. Two 100-ohm resistors placed across a
battery having an internal resistance of 100 ohms dissipate twice as much power as one
of the external resistors.
True -.
False _
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4. If a 3-ohm, 2-watt speaker and a 6-ohm,
1-watt speaker are connected in series, the 1-watt speaker will deliver twice as much
power as the 2-watt speaker .
True _
False _
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9. If the two secondary windings of a transformer
are in series as shown, the output voltage is the sum of the individual secondary coil
voltages.
True _
False _
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5. If two dry cells of equal current and
voltage rating are connected in series across a load, the current-handling capability
of the circuit is increased twofold.
True _
False _
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10. If a 500-ohm. 5-watt resistor and a
500-ohm, 10-watt resistor are in series across a 100-volt source, they are considered
equal to a 1000-ohm, 15-watter.
True _
False _
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See answers below.
Quizzes from vintage electronics magazines such as Popular
Electronics, Electronics-World, QST, 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.
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-
Elementary
Radio Quiz - December 1947 Radio-Craft
- Hi-Fi
Quiz - October 1955 Radio & Television News
- Electronics Physics
Quiz - March 1974 Popular Electronics
- A Baffling Quiz
- January 1968 Popular Electronics
- Electronics IQ
Quiz - May 1967 Popular Electronics
- Plug and Jack
Quiz - December 1967 Popular Electronics
- Electronic
Switching Quiz - October 1967 Popular Electronics
- Electronic
Angle Quiz - September 1967 Popular Electronics
- International
Electronics Quiz - July 1967 Popular Electronics
- FM Radio
Quiz - April 1950 Radio & Television News
- Bridge Circuit
Quiz -December 1966 Popular Electronics
- Diode Function
Quiz - August 1965 Popular Electronics
- Diagram Quiz,
August 1966 Popular Electronics
- Quist Quiz - November
1953 QST
- TV Trouble Quiz,
July 1966 Popular Electronics
- Electronics History Quiz,
December 1965 Popular Electronics
- Scope-Trace Quiz,
March 1965 Popular Electronics
-
Electronic
Circuit Analogy Quiz, April 1973
-
Test Your Knowledge of Semiconductors, August 1972 Popular Electronics
- Ganged Switching
Quiz, April 1972 Popular Electronics
- Lamp Brightness
Quiz, January 1969 Popular Electronics
- Lissajous Pattern Quiz, September 1963 Popular Electronics
- Electronic
Quizoo, October 1962 Popular Electronics
- Electronic Photo Album Quiz, March 1963 Popular Electronics
- Electronic Alphabet Quiz, May 1963 Popular Electronics
- Quiz: Resistive?
Inductive? or Capacitive?, October 1960 Popular Electronics
- Vector-Circuit Matching Quiz, June 1970 Popular Electronics
- Inductance
Quiz, September 1961 Popular Electronics
- RC Circuit Quiz,
June 1963 Popular Electronics
- Diode Quiz, July
1961 Popular Electronics
- Electronic Curves Quiz, February 1963 Popular Electronics
- Electronic Numbers Quiz, December 1962 Popular Electronics
- Energy Conversion Quiz, April 1963 Popular Electronics
- Coil Function
Quiz, June 1962 Popular Electronics
-
Co-Inventors Quiz - January 1965 Electronics World
-
"-Tron" Teasers Quiz - October 1963 Electronics World
- Polarity Quiz
- March 1968 Popular Electronics
-
Television
I.Q. Quiz - October 1948 Radio & Television News
- Amplifier Quiz
Part I - February 1964 Popular Electronics
- Semiconductor
Quiz - February 1967 Popular Electronics
- Unknown
Frequency Quiz - September 1965 Popular Electronics
- Electronics
Metals Quiz - October 1964 Popular Electronics
- Electronics
Measurement Quiz - August 1967 Popular Electronics
- Meter-Reading
Quiz, June 1966 Popular Electronics
- Electronic
Geometry Quiz, January 1965 Popular Electronics
- Electronic
Factor Quiz, November 1966 Popular Electronics
- Electronics
Math Quiz, November 1965 Popular Electronics
- Series Circuit
Quiz, May 1966 Popular Electronics
- Electrochemistry
Quiz, March 1966 Popular Electronics
- Biz
Quiz: Test Your Sales Ability - April 1947 Radio News
- Electronic
Analogy Quiz, November 1961 Popular Electronics
- Electronic
Coupling Quiz, August 1973 Popular Electronics
- Electronics Analogy Quiz, August 1960 Popular Electronics
- Audio Quiz, April
1955 Popular Electronics
- Electronic Unit
Quiz, May 1962 Popular Electronics
- Capacitor
Circuit Quiz, June 1968 Popular Electronics
- Quiz on AC Circuit Theory, December 1970 Popular Electronics
- Magnetic Phenomena Quiz, February 1962 Popular Electronics
- Electronics Geography Quiz, April 1970 Popular Electronics
- Electronic
Menu Quiz, August 1963 Popular Electronics
- Electronic Noise Quiz, August 1962 Popular Electronics
- Electronic Current Quiz, October 1963 Popular Electronics
- Electronic Inventors Quiz, November 1963 Popular Electronics
- Resistor Function
Quiz, January 1962 Popular Electronics
- Electronic Measurement Quiz, January 1963 Popular Electronics
- Vacuum Tube Quiz,
February 1961 Popular Electronics
- Kool-Keeping Kwiz, June
1970 Popular Electronics
- Find the Brightest
Bulb Quiz, April 1960 Popular Electronics
-
Where Do the Scientists Belong? - Feb 19, 1949 Saturday Evening
Post
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Quiz Answers
1. True. With unequal capacitors in series, the voltage across each capacitor is inversely
proportional to its capacitance. This is shown by the formula E = Q/C, where Q, the number
of electrons moving in the circuit, is the same for both capacitors.
2. False. Since the lamps have the same resistance, the applied voltage and the current
in the circuit will be reduced by a factor of one-half. And, since P = EI, each lamp
will operate at one-fourth its rated power.
3. False. As shown, S1 and S2 must both be closed before the lamp will light, so that
the arrangement forms an "AND" circuit.
4. True. Each speaker will receive the same amount of current from the source, and,
since P = I2Z, the power developed will be a function of the voice coil impedance,
Z. The 6-ohm speaker produces twice the power of the 3-ohm speaker for the same input.
5. False. Although the total voltage across the two cells in series equals the sum
of the individual cell voltage, like two similar fuses in series, the current-handling
capability of the circuit is not altered.
6. True. Voltmeter sensitivity is a product of its ohms/volt rating and the scale
setting. On the 5-volt scale, the resistance of the 20,000 ohms/volt meter is 100,000
ohms, while the resistance of the 10,000 ohms/ volt meter is 50,000 ohms. The voltage
drop across the 20,000 ohms/volt meter is greater than the drop across the other meter,
giving a greater deflection.
7. False. From the tube manual, a 6V6 draws 450 ma, while a 12SQ7 draws only 150 ma.
From Ohm's law, the filament resistances are, respectively, 13 ohms and 80 ohms. Therefore,
the current in the series circuit would be approximately 200 ma., placing 2.6 volts across
the 6V6, and more than 15 volts across the 12SQ7.
8. False. Since P = I2R, the reduced current resulting from two resistors
instead of one has a greater effect on the power dissipation than does an increase in
resistance.
9. True. The polarity marks indicate that the secondary voltages are in phase and
are series-aiding. Thus, the output voltage is the sum of the two secondary voltages.
10. False. Since a current of 100 ma. flows in the circuit, the power dissipated by
each resistor is 5 watts (P = EI) for a total dissipation of 10 watts. If a 1000-ohm
resistor is substituted for the two 500-ohm units, the power dissipation remains at 10
watts (by the same formula).
Posted April 9, 2018
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