Question

Give a scientific reason:

Hydroelectric energy, solar energy and wind energy are called renewable energies.

Answer 1

1. Renewable energy is any energy that comes from natural resources such as wind, water, sunlight, and geothermal heat, which is heat that is retained in the earth.
2. Renewable energy is called renewable because it can be easily replenished without the help of a man.
3. There are several types of renewable energy that are used in different ways to make it usable to humans. 
4. Wind energy is converted into wind power. When the wind is harnessed using turbines, it can be used as a way to generate electricity. Because of the advancement in turbine technology and the ability for utility companies to lock in a set price of wind energy costs because the fuel is free, the overall costs of wind power to the consumer are lower than in past years.
5. It is important to understand that with this type of electric power, one should live in a region where natural wind sources are very plentiful.
6. Sunlight, also known as solar energy, is also a common renewable energy source.
7. Sunlight is made useful to humans in the production of electricity by releasing electromagnetic radiation.
8. Once the electromagnetic radiation is captured, usually with the use of photovoltaic cells in a conductor material, it produces electricity and heat.
9. The conductor material ordinarily is silicon because of the abundance of the material.
10. The initial start-up costs for installing solar energy panels in a consumer’s home are usually very costly. It may even take up to ten years to see a return on the investment.
    Geothermal energy is found inside the earth’s core.
11. Utility companies can drill into geothermal energy reservoirs to harness the heat. Once the heat or hot water has been trapped, it can spin turbines to make electricity.

Answer 2

1. The sources of energy that are being produced continuously in nature and are inexhaustible, i.e., they are always available for use, are called renewable sources of energy.
2. Hydroelectric energy, solar energy, and wind energy are produced from energy sources like water, sunlight, and wind, respectively, that are produced continuously in nature and will not get depleted.
   Thus, hydroelectric energy, solar energy, and wind energy are called renewable energies.

Thus, hydroelectric energy, solar energy, and wind energy are called renewable energies.