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Replace Those Units! Trivia Quiz

Many phenomena in the electrical world can be expressed using one unit, instead of several. For example, a volt/ohm is the same as an ampere. Replace the given units in each question with a single unit.

A multiple-choice quiz by eburge. Estimated time: 4 mins.

Author
eburge

Time
4 mins

Type
Multiple Choice

Quiz #
315,681

Updated
Dec 03 21

# Qns
10

Difficulty
Tough

Avg Score
6 / 10

Plays
933

Awards
Top 20% Quiz

One at a Time - Single Page - Timed Game

Question 1 of 10

1. Which single unit can replace ohms x farads? Hint

seconds

coulombs

volts

amperes

NEXT>

Question 2 of 10

2. What can you replace amperes x ohms with? Hint

watts

volts

joules

newtons

NEXT>

Question 3 of 10

3. Tesla x metres^2 can be expressed as a single unit. What is it? Hint

coulomb

joule

ohm

weber

NEXT>

Question 4 of 10

4. Coulombs x volts is the same as which unit? Hint

joules

amperes

newtons

tesla

NEXT>

Question 5 of 10

5. What can replace newtons / (amperes x metres)? Hint

volts

webers

tesla

farads

NEXT>

Question 6 of 10

6. What is coulombs / seconds the same as? Hint

ohms

amperes

watts

joules

NEXT>

Question 7 of 10

7. What is the equivalent of amperes^2 x ohms? Hint

watts

volts

coulombs

newtons

NEXT>

Question 8 of 10

8. Farads x volts can be replaced by which unit? Hint

webers

joules

amperes

coulombs

NEXT>

Question 9 of 10

9. Volts^2 / watts can be expressed with a single unit. Can you name it? Hint

ohms

seconds

tesla

newtons

NEXT>

Question 10 of 10

10. Which single unit can replace (coulombs x tesla x metres) / seconds? Hint

newtons

volts

watts

amperes

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Quiz Answer Key and Fun Facts

1. Which single unit can replace ohms x farads?

Answer: seconds

Resistance is measured in ohms, and capacitance is measured in farads. The formula for finding the time constant, tau τ, is resistance multiplied by capacitance. Thus, an ohm-farad is a second.

2. What can you replace amperes x ohms with?

Answer: volts

Current is measured in amperes, and resistance in ohms. Ohm's Law states that the current multiplied by resistance gives the voltage (or potential difference). Thus, an ampere-ohm is equal to a volt.

3. Tesla x metres^2 can be expressed as a single unit. What is it?

Answer: weber

Magnetic field strength is measured in tesla, and cross-sectional area in square metres. Magnetic flux density is calculated by multiplying the magnetic field strength with the cross sectional area, and is measured in webers. Therefore, a tesla-square metre is equal to a weber.

4. Coulombs x volts is the same as which unit?

Answer: joules

Charge is measured in coulombs, and voltage is measured in volts. Work is calculated by multiplying charge by voltage. Hence, a coulomb-volt is equal to a joule.

5. What can replace newtons / (amperes x metres)?

Answer: tesla

Force is measured in newtons, current in amperes, and distance in metres. Force can be calculated using the formula F=BIl, where F is the force, B is the magnetic field strength, I is the current, and l is the distance. Rearranging this for B, we find that a newton per ampere-metre is a tesla.

6. What is coulombs / seconds the same as?

Answer: amperes

Charge is measured in coulombs, and time is measured in seconds. Current is equal to charge divided by time, and so one coulomb per second will produce one ampere of current.

7. What is the equivalent of amperes^2 x ohms?

Answer: watts

Current is measured in amperes, and resistance in ohms. Power is equal to the square of the current multiplied by the resistance. Thus, one ampere-squared per ohm is a watt.

8. Farads x volts can be replaced by which unit?

Answer: coulombs

Capacitance is measured in farads, and voltage in volts. Charge is equal to capacitance multiplied by voltage. Therefore, one farad-volt is equal to one coulomb.

9. Volts^2 / watts can be expressed with a single unit. Can you name it?

Answer: ohms

Voltage is measured in volts, and power is measured in watts. Power can be calculated using the formula P = (V^2)/R, where P is power, V is voltage, and R is resistance. Rearranging this formula for R gives R = (V^2)/P. Hence, a volt-squared per watt is equal to an ohm.

10. Which single unit can replace (coulombs x tesla x metres) / seconds?

Answer: newtons

Charge is measured in coulombs, magnetic field strength in tesla, distance in metres, and time in seconds. The formula for finding force is F=QBv, where F is force, Q is charge, B is magnetic field strength, and v is velocity. Metres per second are the units for velocity, so this formula can be rewritten as F=(QBd)/t. Therefore, a coulomb-tesla-metre-per-second is equal to a newton.

Source: Author eburge

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