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RF Cafe Quiz #89

RF Engineering Quizzes - RF Cafe WebsiteAll RF Cafe Quizzes make great fodder for employment interviews for technicians or engineers - particularly those who are fresh out of school or are relatively new to the work world. Come to think of it, they would make equally excellent study material for the same persons who are going to be interviewed for a job. Good luck!

A complete list of RF Cafe Quizzes.

Quiz #88: Resistance - RF Cafe WebsiteResistance is the fundamental property of a material to oppose the flow of electric current, converting electrical energy into heat. From the high-conductivity copper traces on a PCB to the specialized carbon-film or metal-film resistors that define voltage levels and bias currents, resistance is the "control valve" of every electronic circuit. While Ohm's Law provides the basic relationship between voltage, current, and resistance, physical reality introduces complexities such as temperature coefficients, power ratings, tolerance variation, and the unavoidable skin effect at high frequencies. Resistors are not just passive elements; they are precision tools used for limiting current, dividing voltages, and matching impedances. This quiz examines these core principles, the factors determining material resistance, the various physical forms of resistors, and the critical design tradeoffs - like noise, thermal stability, and power dissipation - that every engineer must consider when building durable assemblies. Understanding resistance is the essential first step toward mastering the art of reliable circuit design.

 

1. What is the fundamental unit of electrical resistance?





 

2. According to Ohm's Law, what is the formula to calculate current (I)?





 

3. How does the resistance of a wire change if its length is doubled, assuming constant cross-section?





 

4. What is the "Temperature Coefficient of Resistance" (TCR)?





 

5. Which resistor type is generally preferred for high-precision, low-noise RF applications?





 

6. What happens to the total resistance when two identical resistors are placed in parallel?





 

7. What is "skin effect" in relation to resistance?





 

8. What is the power dissipation of a 100-ohm resistor with 10V across it?





 

9. What is a "potentiometer"?





 

10. Why is a high-power wirewound resistor usually made in a ceramic carrier?






Quizzes from vintage electronics magazines (and many custom RF Cafe-generated quizzes) such as Popular Electronics, Electronics-World, QST, Radio-Electronics, 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.

RF Cafe Quizzes

Vintage Electronics Magazine Quizzes

Vintage Electronics Magazine Quizzes
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About the RF Cafe™ Website ©1996-2026

Kirt Blattenberger - RF Cafe WebmasterRF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived...

Webmaster: Kirt Blattenberger  |     BSEE - KB3UON - AMA92498  |  USAF Radar Technician

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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