Scientist have proven that energy is the ability to do work. Work is moving something against a force, like gravity. Energy can be found in things, and take many forms. There are two main energy's called kinetic and potential energy. Kinetic energy is something in motion. While potential energy is energy that is stored up. Scientist say the only way something with potential energy can be kinetic is something with equal or greater force. Energy can travel in waves called electromagnetic waves which are things such as heat, light, radio, and gamma rays. There is another question "What is heat?". To put it simply heat is energy travelling in waves. Things start to heat up when molecules start moving or when a chemical reaction starts such as a match lighting wood to make a big fire. Heat moves in waves through space.
Radiation happens when heat moves as energy waves called infrared waves, directly from its source to something else. This is how the sun heats up the earth by its waves reching all the way to earths surface. Hot things radiate cooler things. This happens by molecules in the cooler object start speeding up.
Convention is the movement caused within a fluid by the tendency of hotter. Therefore less dense material rises and colder denser material to sink under the in fluency of gravity. This consistently results in heat transfer.
Conduction is the process of electricity is directly transmitted through a substance. When there is a difference of temperature or of electrical potential energy. Without movement of materials this happens.
