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Q. SI Unit of electrical energy is
A) Joule
B) Kilowatt-hour
C) kilojoule
D) watt-hour
The SI unit of electrical energy is A) joule.
The SI unit of electrical energy is the joule. Energy can neither be created nor be destroyed. Henceforth electrical energy is produced by the movement of electrically charged particles. It is generally produced by the energy generated by the movement of electrons from one point to another point. Once the energy is converted from potential energy into electrical energy, it can then be transferred into a different form of energy like heat energy, light energy and many more. Electrical generation can be generated by wind, nuclear power, solar power, hydroelectricity, etc.
A joule is a determining unit of energy in the International System of Units. It is equal to the energy transferred to an object when a force of one newton acts upon the object in motion and displaces it one metre. Kilowatt-hour is also a unit of energy as it is the product of the power and time, but it cannot be taken as an SI Unit of the energy. Similarly, watt-hour is also the unit of electrical energy but not the SI Unit. We sometimes get confused with the terms Electrical power and electrical energy. Still, we should end this by knowing that the SI unit of electrical energy is joule and that of electrical power is the watt. The power and force of a machine are 100W. It implies that the machine consumes 100 joules of electrical energy in one moment.
Since Joule is the SI Unit of the work, we can understand by the relation:
work = force*displacement
= mass*acceleration*displacement
= mass*(velocity/time)*displacement
= kg*(ms-1/s)*m
= kgm2s-2
Henceforth, we can conclude with the fact the SI unit of the electrical energy is the joule. We also have other units by which we can define units of electrical energy, but that cannot be considered SI units as SI units are followed worldwide to attain stability.
