POWER and ENERGY
We often consider power and energy to be exact synonyms. Energy and power are closely related but not the same type of physical quantities.
Energy is the capacity to do some physical activities or work, while power is defined as the rate at which the energy is transferred, or the work is completed.
Energy changes from one form to another, but not the power. If something has to happen, energy is said to change its form. Power is known only to measure how fast the change has occurred; in other words, power is defined as the rate at which energy converts every second.