# Bridge Circuit QuizDecember 1966 Popular Electronics

 December 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.

I found this Bridge Circuit Quiz in my stack of vintage Popular Electronics magazines (I thought all had been posted). I just ordered another batch of Popular Electronics on eBay, so that will provide a dozen or so more quizzes. Your challenge here, compliments of Robert P. Balin, is to decide what the main function of each type of bridge circuit is. Most bridge circuits are designed such that a component of unknown value is inserted into one of its four branches, and then one or more variable components of known values are adjusted to balance the bridge and thereby create a minimum (null) between opposite (circuit-wise) nodes. Admittedly, I did not fare well, but it is because I do not recall having the names associated with many of these bridge circuits. Of course nearly everyone is familiar with the Wheatstone, Kelvin, and Wien bridges. Hyperlinks are provided to information on the bridge circuit theory. I could not find any specific page for Mr. Resonance's bridge, but interestingly many of the pages Google returns has to do with the Tacoma Narrows Bridge (Galloping Gertie) self-destruction due to resonance.

## Bridge Circuit Quiz

By Robert P. Balin

Most electronic technicians are familiar with the widely used Wheatstone bridge. But many are not so familiar with other types of bridges commonly used in the laboratory for measurement of impedance-resistive, reactive, inductive, or capacitive - at frequencies well up into the UHF band. Bridges employ the so-called null method to measure an unknown quantity, either directly or by computation. In the latter case, values of some of the fixed and adjustable components in the bridge are substituted in an applicable equation, which is then solved for the unknown quantity. See how many circuits (A-J) you can identify by name (1-10).

 1  Carey Foster  ___ 2  Hay  ___ 3  Heaviside  ___ 4  Kelvin  ___ 5  Maxwell  ___ 6  Owen  ___ 7  Resonance  ___ 8  Schering  ___ 9  Wheatstone  ___ 10  Wien  ___

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.

 Electronics IQ Quiz - May 1967 Plug and Jack Quiz - December 1967 Electronic Switching Quiz - October 1967 Electronic Angle Quiz - September 1967 International Electronics Quiz - July 1967 Bridge Circuit Quiz -December 1966 Diode Function Quiz - August 1965 Diagram Quiz, August 1966 TV Trouble Quiz, July 1966 Electronics History Quiz, December 1965 Scope-Trace Quiz, March 1965 Electronic Circuit Analogy Quiz, April 1973 Test Your Knowledge of Semiconductors, August 1972 Ganged Switching Quiz, April 1972 Lamp Brightness Quiz, January 1969 Lissajous Pattern Quiz, September 1963 Electronic 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 Inductance Quiz, September 1961 RC Circuit Quiz, June 1963 Diode Quiz, July 1961 Electronic Curves Quiz, February 1963 Electronic Numbers Quiz, December 1962 Energy Conversion Quiz, April 1963 Coil Function Quiz, June 1962 Semiconductor Quiz - February 1967 Unknown Frequency Quiz - September 1965 Electronics Metals Quiz - October 1964 Electronics Measurement Quiz - August 1967 Meter-Reading Quiz, June 1966 Electronic Geometry Quiz, January 1965 Electronic Factor Quiz, November 1966 Electronics Math Quiz, November 1965 Series Circuit Quiz, May 1966 Electrochemistry Quiz, March 1966 Electronic Analogy Quiz, November 1961 Electronic Coupling Quiz, August 1973 Electronics Analogy Quiz, August 1960 Audio Quiz, April 1955 Electronic 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 Resistor Function Quiz, January 1962 Electronic Measurement Quiz, January 1963 Vacuum Tube Quiz, February 1961 Kool-Keeping Kwiz, June 1970

1 - J   The Carey Foster bridge measures capacitance in terms of mutual conductance, and mutual conductance in terms of capacitance.

2 - H   The Hay bridge measures the self-inductance of high-Q coils (Q greater than 10), and also determines unknown frequencies.

3 - D   The Heaviside bridge measures the mutual inductance of the coils of a transformer in terms of a known self-inductance and known resistances.

4 - I   The Kelvin bridge is used when extremely low resistances - down to 0.001 ohm - are to be measured.

5 - C   The Maxwell bridge measures the self-inductance of low-Q coils (Q of 10 or less).

6 - F   The Owen bridge, like the Hay and Maxwell bridges, measures the self-inductance of coils. The main difference between the Owen and the other two bridges is that the Owen bridge has the two adjustable components in the same arm.

7 - A   The Resonance bridge measures capacitance, inductance, and frequency.

8 - G   The Schering bridge measures capacitance in terms of a standard capacitor and known resistances.

9 - B   The Wheatstone bridge, oldest of the bridge family, is used where accurate resistance measurements - in the range of 1 ohm to approximately 1 megohm - are to be made.

10 - E   A Wien bridge is used to measure capacitance by comparison with a standard capacitor, and inductance by comparison with a standard inductor.

Posted June 22, 2018

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