Energy

Which are characteristics of energy?

[blank_start]Kinetic[blank_end] energy. Anything that moves, like wind, water currents and falling objects, contain this type of energy. [blank_start]Chemical[blank_end] energy. Combustibles or objects that can explode contain this type of energy. Burning a combustible converts its energy into heat and light [blank_start]Thermal[blank_end] energy. This type of energy is perceived as heat. [blank_start]Luminous[blank_end] energy. Some objects, such as the Sun or a flame, emit this type of energy called light. [blank_start]Electrical[blank_end] energy. In nature, this energy causes ligtning in a storm. [blank_start]Magnetic[blank_end] energy. This type of energy attracts metal objects.

Energy got mass and volume like matter

[blank_start]Energy sources[blank_end] are certain materials or natural events, which emit energy that we can use. They can be [blank_start]renewable[blank_end] or [blank_start]non-renewable[blank_end].

Renewable energy sources

Everything contains a certain amount of thermal energy that we can measure. This is called the [blank_start]temperature[blank_end]. [blank_start]Heat[blank_end] is the transfer of thermal energy from one type of matter with a higher temperature to another type of matter with a lower temperature.

Heat can be transferred in the following ways: By [blank_start]contact[blank_end]. If we put a pan of cod water on a fire transfers firstly to the pan and then to the water. At a [blank_start]distance[blank_end]. We can feel the heat from the Sun or from a flame without touching it

Sound has got [blank_start]kinetic[blank_end] energy. It originates from something vibrating.

Some materials react to light and produce a light phenomenon. The most common light phenomena are [blank_start]dispersion[blank_end], [blank_start]reflection[blank_end] and [blank_start]refraction[blank_end].

If light travels through a material that slows it down, such as glass and water, it changes direction. This bending of light is called [blank_start]refraction[blank_end]. [blank_start]Dispersion[blank_end]: white light separates into different colours when it passes through certain substances. When the Sun sets over a still lake, we can see it reflected in the water. This is because part of the light is reflected from the surface of the water towards our eyes. This phenomenon is called [blank_start]reflection[blank_end]