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Sources of energy 
Renewable energy
Renewable sources are ones which can be recycled or reused. - solar power, wind power, hydroelectric (water) power, geothermal (Earth's heat) power, biomass (plants and waste), air and water.
Nonrenewable energy
Non-renewable sources cannot be reused and so there is a limited amount available and when that runs out there will be none left. fossil fuels (coal, oil and natural gas) and nuclear fuels
Potential and Kinetic
energy
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Law of conservation of energy: The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another. This means that a system always has the same amount of energy, unless it's added from the outside.
Heat transfer: Heat is the transfer of energy. During energy transfer, the energy moves from the hotter object to the colder object. This means that the hotter object will cool down and the colder object will warm up. The energy transfer will continue until both objects are at the same temperature.
Heating as a transfer of
energy: Heat is the transfer of energy. During energy transfer, the energy moves from the hotter object to the colder object. This means that the hotter object will cool down and the colder object will warm up. The energy transfer will continue until both objects are at the same temperature.
Conduction: When energy is transferred to an object, the energy of the particles increases. This means the particles have more kinetic energy and they start to move and vibrate faster. As the particles are moving faster they "bump" into other particles and transfer some of their energy to those neighbouring particles. In this way, the energy is transferred through the substance to the other end. This process is called conduction.
Convection: Think of a pot of water on a stove. Only the bottom of the pot touches the stove plate, but all of the water inside the pot, even the water not touching the sides, becomes warmer. How does the energy transfer throughout the water in the pot? The transfer of energy is because of convection. The process of heat transfer from one part of a fluid to another part by the actual movement of the particles of the fluid is called convection.
Radiation: The process of the transfer of the heat from one place to another place without heating the intervening medium is called radiation. For example, the heat from the sun reaches the earth through radiation mode. They can reflect and refract like light waves.
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