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Ohm's Law Quiz
RF Cafe Quiz #90

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 #90: Ohm's Law - RF Cafe WebsiteOhm's Law is the bedrock of electrical engineering. Formulated by Georg Simon Ohm in 1827, it establishes the fundamental linear relationship between voltage (V), current (I), and resistance (R) in an ideal conductor. This simple yet profound equation -- V = IR -- allows engineers to predict circuit behavior, design voltage dividers, calculate power dissipation, and troubleshoot complex systems with ease. While it holds true for most metallic conductors under constant temperature, real-world circuits often involve non-linear components and temperature-dependent materials where the law must be applied with nuance. This quiz covers the core mathematical relationships, units of measure, power calculations, and the practical application of Ohm's Law in both series and parallel circuit configurations. Whether you are refreshing your understanding of basic circuit theory or preparing for more advanced analysis, mastering these principles is essential. Test your knowledge of the most vital equation in all of electronics below. 

 

1. What is the standard mathematical expression for Ohm's Law?





 

2. If a circuit has a voltage of 12V and a resistance of 4 ohms, what is the current?





 

3. If current is held constant, what happens to voltage if resistance is doubled?





 

4. Which formula correctly represents Power (P) in terms of Voltage and Current?





 

5. In a series circuit, how does total resistance change as you add more resistors?





 

6. What is the resistance of a device that draws 2A from a 10V source?





 

7. Using Ohm's Law, what is the power dissipation of a 10-ohm resistor with 2A flowing through it?





 

8. What happens to the current in a circuit if the resistance approaches zero (a short circuit)?





 

9. A voltage divider consisting of two 1k-ohm resistors in series connected to a 10V source results in what voltage at the midpoint?





 

10. If an LED requires 2V and you have a 12V source, what resistor value is needed for a 10mA (0.01A) current?






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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