Among the same amount of water, steam and ice, steam contains most of the power and ice contains least of the power. Vapor molecules move frequently and add power with its intrinsic kinetic energy. Whereas, the molecules of ice remain still and doesn’t have any kinetic energy. So, steam has the highest energy and ice has the lowest energy.

The road to climb the mountain is made by turning around the mountain as this circular road creates smallest angle with the mountain resulting in less effort to climb. The less the angle, the more the length of road with sloping floor. Such a road lefts less force and less energy to climb.

The steam turbine is the most efficient engine and for this reason steam turbine is universally used for electrical generation

The electric energy travels along the phone wires and is converted back into acoustic energy at the receiving end. Indeed, the telephone system converts acoustic energy (sound) into electric energy. 

A dynamo is an electrical generator that creates direct current using mechanical energy from commutator’s rotating part.

A photoelectric (solar) cell is an electric device that converts energy of light directly into electrical energy through photovoltaic effect.

The energy derived from natural sources that are replenished at a higher rate than they are consumed is renewable energy. Sunlight, water flow and wind are such types of sources that are constantly being replenished. 

When electric energy converts into sound through a medium, it is called sound power.

Any stable object, accumulating energy for its stagnation, is known as potential energy. Any object in a stable state slowly accumulates static energy. When the water is blocked by a dam in the river, the potential energy is mainly accumulated as a result of the increase in the height of the water basin. Potential energy is converted into kinetic energy when water falls. Potential Energy = weight of object  height.

Power is the quantity of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, which is equal to one joule per second. The Watt, is named after the name of James Watt, a Scottish inventor.