Question

One Volt is equal to

• A. $1$ Joule
• B. $1$ Newton/Coulomb
• C. $1$ Joule/Coulomb
• D. $1$ Coulomb/Newton

Answer 1

The correct option is C

$1$ Joule/Coulomb

Explanation for Correct answer:

In case of option C.

1. A voltage difference of one volt is able to drive one ampere of current through a conductor that has a resistance of one ohm.
2. One joule of work is equal to that amount of work, which is required to move an electric charge of one coulomb across a potential difference of one volt.
3. Thus, one volt is equivalent to one joule per coulomb.
4. Mathematically,

$V=\frac{∆U}{q}=\frac{Joule}{Coulomb}$, Where $∆U$=Change in kinetic energy measured in joules, $q$= charge between two points measured in coulomb.

Explanation for incorrect answers:

In case of option A.

1. Joule is a unit of work or energy in the SI units.
2. Joule is equal to the work done by a force of one newton acting through the length of one meter.
3. Thus, option A is incorrect.

In case of option B.

1. Newton per Coulomb $\left(\raisebox{1ex}{$N$}\!\left/ \!\raisebox{-1ex}{$C$}\right.\right)$ is a unit of a category of Electric field strength.
2. Thus, option B is incorrect.

In case of option D.

1. Coulomb/Newton is the reciprocal of the unit of the category of Electric field strength.
2. Thus, option D is incorrect.

Thus, the correct option is option C.