# Energy

Energy is the property that must be transferred to an object in order for the object to be worked on.[1] cannot be seen, created, or destroyed. This is called the Law of Conservation of Matter. However, energy can be converted into one form of energy to another. There are several forms of energy:

• Kinetic energy is energy in moving objects,
• Chemical Potential energy is energy stored in food and chemicals,
• Thermal energy is heat,
• Sound energy takes the form of vibrations,
• Electrical energy is made by electrons being transferred from one atom to another,
• Light energy, also known as electromagnetic radiation,
• Nuclear energy, which is stored in the nuclei of atoms,
• Elastic Potential energy, in stretched out objects like a rubber band,
• and Gravitational Potential energy, in objects above the ground, far away from the Earth's core.

### Energy Transformations

Energy, as stated above, can be converted from one form to another. An example of this would be electrical energy being converted to light energy inside a lightbulb, and electrical energy being converted into kinetic and heat energy and kinetic energy.

### Wasted Energy

Energy transformations can result in unwanted forms on energy that is usually more than the desired energy. This process is called energy efficiency. An example of this is heat energy being made when a lightbulb converts electrical energy into light energy. To calculate how much energy was wasted and useful, use this formula:

Efficiency = ${\displaystyle (}$Wasted Energy${\displaystyle /}$Total Energy$\displaystyle ) * 100%$

Energy is measured in joules (J), which are used to measure any sample of energy, including energy in food.