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Ohm's Lore Trivia Quiz

My geek friends and I have designed this quiz to be conducive to the current interest in Ohm and his law. Resistance is expected.

A multiple-choice quiz by LilahDeDah. Estimated time: 5 mins.

Author
LilahDeDah

Time
5 mins

Type
Multiple Choice

Quiz #
212,878

Updated
Nov 16 24

# Qns
10

Difficulty
Average

Avg Score
7 / 10

Plays
4795

Awards
Top 35% Quiz

One at a Time - Single Page - Timed Game

Question 1 of 10

1. The formula for Ohm's law is correctly expressed as which of the following? Hint

P=VI

V=IR

V=d(i)/dt*z

F=1/2*pi(sqrt(LC))

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Question 2 of 10

2. Which of the following sentences best expresses Ohm's law?
Hint

The total electric flux through any closed surface (a surface enclosing a definite volume) is proportional to the total net electric charge inside the surface.

The amount of electric current through a metal conductor in a circuit is directly proportional to the voltage impressed across it, for any given temperature.

In fluid flow, an increase in velocity happens simultaneously with a decrease in pressure.

The laminar flow rate of an incompressible fluid along a pipe is proportional to the fourth power of the pipe's radius.

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Question 3 of 10

3. When writing a formula, resistance is expressed in ohms. What symbol is used for this unit? Hint

The Roman letter "O"

The Sanskrit character "Om"

The Greek letter "Omicron"

The Greek letter "Omega"

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Question 4 of 10

4. Georg Ohm gave his name to the unit of electrical resistance. What are the first names of the men after whom other important properties of capacitance and inductance are named? Hint

Gauss and Amp�re

VanCleefe and Arpelles

Joseph and Michael

Kristoffer and Russell

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Question 5 of 10

5. The inverse of an ohm was once commonly known as a mho. What is the unit of measurement for conductance in today's jargon? Hint

Impedance

Kyles

Siemens

Ohm^-1

6. The year 1820 was obviously an exciting time to be a physicist. Which of the following is NOT a correct statement about scientists whose discoveries happened around the same time as Ohm's? Hint

Andr�-Marie Amp�re formulates the basics of electrodynamics in November of 1820

Danish physicist Hans Oersted discovers electromagnetism in July of 1820

1820: Nicola Tesla and Thomas Edison commence their famous AC/DC feud

During the years 1820-1, at least three people independently invent the galvanometer

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Question 7 of 10

7. Resistance, we are told, is futile. A substance with a low resistance to the flow of electricity is called a CONDUCTOR. What is a substance with a high resistance called? Hint

An insulator

An antiresistor

A metal

An immunity

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Question 8 of 10

8. Although most conductive materials obey Ohm's law, some do not and are said to be nonohmic. A diode is an example of a nonohmic conductor. Why don't diodes obey Ohm's law? Hint

They are extremely sensitive to temperature fluctuations

They have different resistances depending on which way the current is flowing through them

They are the sociopaths of the electrical engineering world

Diodes were invented long after Ohm discovered his law

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Question 9 of 10

9. It's time to use Ohm's law to solve a real problem.
If we have a small circuit consisting of a 10-volt battery and a small light with an impedance of 1 ohm, what is the current? Hint

10 amps

1 amp

10^1.5 amps

5 amps

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Question 10 of 10

10. Although it would eventually become "the law", Ohm's elegant theory was not accepted for many years and he suffered both poverty and ridicule.

Who stated: "When a true genius appears in this world, you may know him by this sign, that the dunces are all in confederacy against him."? Hint

Swift

Einstein

Quayle

Confucius

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Quiz Answer Key and Fun Facts

1. The formula for Ohm's law is correctly expressed as which of the following?

Answer: V=IR

Yes, we needed to get that out of the way right off the bat.
Ohm's law states that the current flow through a conductor is directly proportional to the potential difference (voltage) and inversely proportional to the resistance.

I=Current flow V=potential and R=Resistance.

2. Which of the following sentences best expresses Ohm's law?

Answer: The amount of electric current through a metal conductor in a circuit is directly proportional to the voltage impressed across it, for any given temperature.

It was surprisingly difficult to find a non-geek explanation of Ohm's law, so thank you to www.opamp-electronics.com for the correct answer.

The laminar flow statement illustrates Poiseuille's Law, which is comparable to Ohm's law except that Ohm's concerns electricity and Poiseuille's is about fluids. (Got that? Great.)

The statement about electric flux is Gauss' Law.

Bernoulli's fluid dynamics principle is from www.absoluteastronomy.com's list of eponymous scientific laws, which make fascinating reading.

3. When writing a formula, resistance is expressed in ohms. What symbol is used for this unit?

Answer: The Greek letter "Omega"

Ohms are symbolized by the upper-case Greek letter omega. Although most Greek letters have been commandeered for use by scientists, omicron has mostly escaped this fate because it resembles an "O" and would be confusing in formulae.

4. Georg Ohm gave his name to the unit of electrical resistance. What are the first names of the men after whom other important properties of capacitance and inductance are named?

Answer: Joseph and Michael

The unit of inductance is called the henry, after Joseph Henry (1797-1878), American physicist and first Secretary of the Smithsonian Institution.
The unit of capacitance is called the farad, after Michael Faraday (1791-1867), British inventor of the electric motor, the dynamo, the transformer, and the generator.
One farad is equivalent to one coulomb of stored charge per volt of applied potential difference.

(Are you wondering what a coulomb is? Have you ever also wondered what the name of one unit of trivia is? Yes, these are things that make you go "Ohmmmm"...)

5. The inverse of an ohm was once commonly known as a mho. What is the unit of measurement for conductance in today's jargon?

Answer: Siemens

Mho is the the inverse of a resistance, in other words 1/r. If we look at our now-familiar formula
V=IR,
we see that it could also be configured as

I=V/r = I=V*(1/r), which is I=V*Mho

German electrical engineer Werner von Siemens did some studies with this and the unit was renamed after him.
(It is interesting to note that while the unit is now called a siemens, "mho" is still a viable Scrabble word, and I encourage its use as such.)

6. The year 1820 was obviously an exciting time to be a physicist. Which of the following is NOT a correct statement about scientists whose discoveries happened around the same time as Ohm's?

Answer: 1820: Nicola Tesla and Thomas Edison commence their famous AC/DC feud

Oersted first demonstrated electromagnetism in 1820.

Within a few months, Amp�re, studying Oersted's work, formulated his law of electromagnetism (Amp�re's law) that describes mathematically the magnetic force between two electric currents.

The first galvanometer (a tool for measuring the strength and direction of electric current) was built in Germany by Johann S. Schweigger in 1820, but Johann Poggendorff of Berlin and James Cumming in Cambridge, England built theirs at almost the same time.

Tesla and Edison's "War of Currents", while very real and historically fascinating, didn't take place until the late 1880s.

7. Resistance, we are told, is futile. A substance with a low resistance to the flow of electricity is called a CONDUCTOR. What is a substance with a high resistance called?

Answer: An insulator

Almost any substance will conduct electricity if the voltage is high enough, but insulators will...well...resist longer.

8. Although most conductive materials obey Ohm's law, some do not and are said to be nonohmic. A diode is an example of a nonohmic conductor. Why don't diodes obey Ohm's law?

Answer: They have different resistances depending on which way the current is flowing through them

Ohmic (obedient Ohm's law-abiding) materials produce linear current-voltage graphs; in nonohmic materials, the resistance is not constant.

For ohmic materials, the resistance is the inverse of the slope of the straight line.

9. It's time to use Ohm's law to solve a real problem. If we have a small circuit consisting of a 10-volt battery and a small light with an impedance of 1 ohm, what is the current?

Answer: 10 amps

Remember: Ohm's law is V=IR where V is voltage, current is I and R is resistance (also known as impedance).

If the voltage is 10 and the light has an impedance of 1 and we know that current is denoted as I, we get the following equation 10=I X 1. I therefore equals 10.

10. Although it would eventually become "the law", Ohm's elegant theory was not accepted for many years and he suffered both poverty and ridicule. Who stated: "When a true genius appears in this world, you may know him by this sign, that the dunces are all in confederacy against him."?

Answer: Swift

Voltage and current were considered to be unrelated phenomena before Ohm realized that if he were to take a similar wire of twice the size the current would divide in half. Although this is amazingly simple to prove with resistors today, it took the scientific community of Ohm's time more than ten years to believe.

Satirist Johnathan Swift's quote is from his 1711 "Thoughts on Various Subjects". I hope this quiz on Ohm and various other subjects has been enjoyable; please don't bypass my others!

Source: Author LilahDeDah

This quiz was reviewed by FunTrivia editor crisw before going online.
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