Electricity is the flow of electric power or charge. It is the set of physical phenomena associated with the presence and motion of matter that has the property of electric charge.

CONVENTIONAL SOURCES OF ELECTRICITY
Conventional Sources of Energy are also known as non-renewable sources of energy and are available in limited quantities. These non-renewable sources of energy are the decaying matters, which take over hundreds of years to form, for example, coal, petroleum, etc. So, if they are depleted once, they can never be generated at a speed or pace, which could sustain their rate of consumption.

NON-CONVENTIONAL/RENEWABLE SOURCES OF ELECTRICITY
These are replenished by natural processes, that too continuously. The non-conventional sources of energy can’t be exhausted easily and can be generated at a constant rate for their use over and over again. Furthermore, these energy sources do not pollute the environment and natural surroundings and require less expenditure. A few examples of non-conventional sources of energy include wind energy, tidal energy, solar energy, geothermal energy, and biomass energy. The reason why they are also called renewable sources of energy lies in the fact that they can be produced or generated through natural processes, at a rate greater than or equal to the rate of their consumption.