What is Energy?

Before learning about energy efficiency, let's learn about energy briefly.

What is energy?
Energy is the ability to do work. It comes in different forms.

For example,
⇾ Heat (thermal)
⇾ Light (radiant)
⇾ Motion (kinetic)
⇾ Electrical
⇾ Chemical
⇾ Nuclear energy

⇾ Gravitational

Energy sources are divided into two groups:

⇾ Renewable (an energy source that can be easily replenished)

     There are five main renewable energy sources:

•      ↪ Solar energy from the sun
•      ↪Geothermal energy from heat inside the earth
•      ↪Wind energy
•      ↪Biomass from plants
•      ↪Hydropower from flowing water

⇾ Nonrenewable (an energy source that cannot be easily replenished)

•      ↪ Petroleum products
•      ↪ Hydrocarbon gas liquids
•      ↪ Natural gas
•      ↪ Coal
•      ↪ Nuclear energy