What is energy


In physics, energy is an indirectly observed quantity that understood as ability of a physical system to do work. Since work is defined as a force acting through a distance (a length of space), energy is always equivalent to the ability to exert pulls or pushes against the basic forces of nature, along a path of a certain length.

Distinction between energy and power

Power is not at all the same as energy, but is the rate at which energy is converted (or, equivalently, at which work is performed).

By allowing the water above the dam to pass through turbines, converts the water's potential energy into kinetic energy and ultimately into electric energy, whereas the amount of electric energy that is generated per unit of time is the electric power generated. The same amount of energy converted through a shorter period of time is more power over that shorter time.

Conservation of energy

according to law of conservation energy, energy can neither be created (produced) nor destroyed by itself. It can only be transformed.

Example of Kinetic energy 

Types of energy

- Kinetic energy
- Light energy
- Sound energy
- Electrical energy
- Chemical energy
- Heat energy
- Elastic energy

Electrical Potential energy

Electric potential energy, or electrostatic potential energy, is a potential energy (joules) that results from conservative Coulomb forces and is associated with the configuration of a particular set of point charges within a defined system. Not to be confused with the term electric potential (volts), the term "electric potential energy" is used to describe the potential energy in systems with electric fields that change with time (time variant), while the term "electrostatic potential energy" is used to describe the potential energy in systems with electric fields that do not change with time (time invariant).

Electrical energy is energy newly derived from electrical potential energy. When loosely used to describe energy absorbed or delivered by an electrical circuit (for example, one provided by an electric power utility) "electrical energy" refers to energy which has been converted from electrical potential energy. This energy is supplied by the combination of electric current and electrical potential that is delivered by the circuit. At the point that this electrical potential energy has been converted to another type of energy, it ceases to be electrical potential energy. Thus, all electrical energy is potential energy before it is delivered to the end-use. Once converted from potential energy, electrical energy can always be described as another type of energy (heat, light, motion, etc.).

Green Energy / Renewable Energy

Nowadays, we always heard about green energy or renewable energy. but how do we implemented to that?
Renewable energy comes from natural resources such as sunlight, wind, rain, tides, and geothermal heat, which are renewable(naturally replenished).

Mainstream forms of renewable energy
- wind power
- hydropower
- solar energy
- biomass
- biofuel
- geothermal energy

"Help save the environment, reduce global warming, save energy"


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