Select the option that is related to the third word in the same way as the second word is related to the first word. (The words must be considered as meaningful English words and must not be related to each other based on the number of letters/number of consonants/vowels in the word.)
Force : Newton :: Current : ?

Question

Select the option that is related to the third word in the same way as the second word is related to the first word. (The words must be considered as meaningful English words and must not be related to each other based on the number of letters/number of consonants/vowels in the word.)

Force : Newton :: Current : ?

Prepp Team · Accepted Answer

Understanding Analogies: Force, Newton, Current

This question presents an analogy, asking us to find the word that completes the pair based on the relationship between the first two words. The relationship between 'Force' and 'Newton' needs to be identified first. 'Force' is a fundamental physical quantity, and 'Newton' ($\text{N}$) is the standard International System of Units (SI) unit used to measure force.

So, the relationship is: Physical Quantity : SI Unit

Applying the Analogy to Current

Now, we apply the same relationship to the third word, 'Current'. 'Current', specifically electric current, is also a fundamental physical quantity. We need to find its corresponding SI unit from the given options.

Analysing the Options for Current's SI Unit

Let's look at the options provided:

Volt
Ampere
Charge
Coulomb

We need to determine which of these represents the SI unit for electric current.

Volt (V): This is the SI unit of electric potential or voltage. It is not the unit for electric current.
Ampere (A): This is the SI unit of electric current. One ampere is defined as one coulomb of charge per second.
Charge: This is a physical quantity itself, specifically electric charge, measured in Coulombs. It is not the unit of current.
Coulomb (C): This is the SI unit of electric charge, not electric current.

Based on this analysis, the SI unit for Current is Ampere.

Confirming the Relationship

The analogy is:

Force : Newton :: Current : Ampere

This follows the pattern: Physical Quantity : SI Unit :: Physical Quantity : SI Unit.

Physical Quantity	SI Unit
Force	Newton ($\text{N}$)
Electric Current	Ampere ($\text{A}$)
Electric Potential (Voltage)	Volt ($\text{V}$)
Electric Charge	Coulomb ($\text{C}$)

Therefore, the word that completes the analogy is Ampere.

Revision Table: Physical Quantities and SI Units

Physical Quantity	Symbol	SI Unit	Unit Symbol
Length	$L$	Metre	m
Mass	$M$	Kilogram	kg
Time	$T$	Second	s
Electric Current	$I$	Ampere	A
Thermodynamic Temperature	$\Theta$	Kelvin	K
Amount of Substance	$N$	Mole	mol
Luminous Intensity	$J$	Candela	cd
Force	$\vec{F}$	Newton	N
Electric Charge	$Q$	Coulomb	C
Electric Potential	$V$	Volt	V

Additional Information: Understanding SI Units

The International System of Units (SI) is the modern form of the metric system and is the most widely used system of measurement. It is built upon seven base units from which all other SI units are derived. Using SI units ensures consistency and ease of communication in science, engineering, and commerce worldwide.

Derived units, like the Newton (for force) and the Ampere (for current), are formed by combining base units. For example, one Newton is defined as $1 \text{ kg} \cdot \text{m}/\text{s}^2$, and one Ampere is defined as $1 \text{ C}/\text{s}$ or $1 \text{ A} = 1 \text{ C}/\text{s}$. Understanding these units and the quantities they measure is crucial in physics and related fields.