Question

The electron volt (e.V) is the unit of:
A. Power
B. Voltage
C. Current
D. potential
E. Energy

Answer 1

Hint: We know that eV is defined as the kinetic energy gained by an electron when accelerated through a potential difference of 1 V. or we can say that Joule is a derived unit of energy in the International System of units or SI unit.

Complete step by step answer:
Electron volt in short e.V is the unit of energy. We can define the electron volt specifically that energy needed for an electron to move through potential difference of 1 Volt. Or we can also say the amount of energy needed by a proton to move in the opposite direction through the same given potential difference.
Hence the correct option is E.

Additional Information
Mega electron volt is the unit of energy which is useful to deal with the energy released during nuclear reactions. This helps in the derivation of the unit of mass the $\dfrac{MeV}{{{C}^{2}}}$ which is helpful in looking at nuclear reactions.
S.I unit of power is watt. Watt is defined to calculate the rate of transfer of energy. 1 watt is defined as transfer of 1 joule of energy per second.
S.I unit of voltage is volt. Volt is defined as a potential difference between two points when 1 watt power is dissipated due to the current flow of 1 amp between the two points.
S.I unit of current is ampere. 1 Ampere is equal to flow of 1 coulomb charge in 1 sec.

Note:
This small unit electron volt is used to discuss the energy released in chemical reactions. Or energy released when electrons move closer or further from the nucleus in an atom. It is also used in converting mass to energy.