Why energy considered a renewable resource?

Answer 1

That depends on where the energy comes from. Say the heat from the sun is a renewable source. Electricity fro m solar cells to a large extent is a renewable source as is wind power and wave or tidal power. If you have to use coal oil or uranium to get no.

Answer 2

Energy is neither created nor destroyed, it is only transformed into another type of energy. By this, it means that Light energy (from the sun, for example) can be turned by plants into chemical energy, which when eaten by herbivores are turned to mechanical energy (when they use it to move) and so on. So basically, energy moves in a circular "flow" and being so, it is said to be renewable, since none of it is actually "lost"

Answer 3

Neither.

Energy is NOT a resource.

It can not be created and or destroyed

----------------------------------

Energy is a way to quantify how much work can be done. For example, if you push a block of steel along a very very long track. The distance it takes for you to pass out multiplied by the force that you applied to the block is called the energy. So its the amount of energy you have in your body to continue pushing the block.

The concept of "renewable" vs "non-renewable" resources asks whether the way you produce energy is renewable. In my example above, if you drink all the water on the earth just to move the block more, then water is NOT a renewable energy. But if you recycle your urine into drinkable water and drink that (this is completely safe by the way) then water is now a renewable resource. So it also matters how we use the resource as to whether it is renewable.

Semi-renewable resouces:

Trees are considered a renewable so far as we do not use them all to make a giant tower or city of towers. But if we use them at a rate that the trees can naturally regrow new trees, then they are a renewable resource.

Completely non-renewable resources:

A definitively non-renewable resource would be coal or nuclear power. There is a finite amount of coal on the planet and our coal power plants burn the coal which turns it into ash, which is not burnable. As a result the amount of coal on the planet is decreasing and the process to generate coal takes hundreds to thousands of millenia. As a result, the coal on the planet is decreasing and will not be replenished (renewed) in lifetime of the human species.

Also, for nuclear power, the amount of uranium and plutonium on earth is very finite and when we use it in a nuclear reactor we are splitting it into iron, nickel and other elements or particles. The process to create new uranium requires a super nova explosion of a star, so that would be out for renewability.

Completely Renewable Resources:

But, if we do not actually take anything away from the system to create the energy then that is the best form of renewable energy that the politicians are talking about today. Particularly solar, tidal and wind energy. We absorb sunlight in photovoltaic cells and convert it into electricity. We spin water or wind turbines and through magnetic induction generate electricity. These are truly renewable because no resource is expended to produce the energy. Metal or plastic is required to build the turbines and light absorbing cells, but there is a finite and small initial materials cost with a long lasting benefit to use.

Answer 4

It is.

For example, the Ivanpah Solar Power Facility utilizes solar power to heat water. Since solar energy is considered renewable, thermal energy will be renewable as well.

Answer 5

it depends what type of energy it is