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Question

The unit of e.m.f is


A

Joule

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B

Joule-coulomb

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C

Volt-coulomb

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D

Joule/coulomb

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Solution

The correct option is D

Joule/coulomb


The explanation for correct answer:-

In the case of option D,

  1. EMF is produced as the energy is converted from one form to another in a generator or a battery as the device does work on the electric charge being transformed within it.
  2. The work done on a unit of electric charge gained per unit of electric charge, E=WQ
  3. Here, W is work done which has the unit joule (J) and Q is the charge with the unit coulomb.
  4. So, the SI unit of emf is derived as joules per coulomb.

The explanation for incorrect answer:-

In the case of option A,

  1. Joule is the SI unit of Work.
  2. Hence it is incorrect.

In the case of option B,

  1. Joule-Coulomb does not exist.
  2. Hence it is incorrect.

In the case of option C,

  1. Joule can be written as Volt-coulomb.
  2. So Volt-coulomb is also a unit of Work.
  3. Hence it is incorrect.

Hence, option D is the correct option.


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