hydroelectric energy, solar energy and wind energy are called renewable energies. why?
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What is renewable energy?
Renewable energy is energy derived from natural sources that are replenished at a higher rate than they are consumed. Sunlight and wind, for example, are such sources that are constantly being replenished. Renewable energy sources are plentiful and all around us.
What is renewable energy?
Renewable energy is energy derived from natural sources that are replenished at a higher rate than they are consumed. Sunlight and wind, for example, are such sources that are constantly being replenished. Renewable energy sources are plentiful and all around us.
Fossil fuels - coal, oil and gas - on the other hand, are non-renewable resources that take hundreds of millions of years to form. Fossil fuels, when burned to produce energy, cause harmful greenhouse gas emissions, such as carbon dioxide.
Generating renewable energy creates far lower emissions than burning fossil fuels. Transitioning from fossil fuels, which currently account for the lion’s share of emissions, to renewable energy is key to addressing the climate crisis.
Renewables are now cheaper in most countries, and generate three times more jobs than fossil fuels.
Here are a few common sources of renewable energy:
SOLAR ENERGY
Solar energy is the most abundant of all energy resources and can even be harnessed in cloudy weather. The rate at which solar energy is intercepted by the Earth is about 10,000 times greater than the rate at which humankind consumes energy.
Solar technologies can deliver heat, cooling, natural lighting, electricity, and fuels for a host of applications. Solar technologies convert sunlight into electrical energy either through photovoltaic panels or through mirrors that concentrate solar radiation.
Although not all countries are equally endowed with solar energy, a significant contribution to the energy mix from direct solar energy is possible for every country.
The cost of manufacturing solar panels has plummeted dramatically in the last decade, making them not only affordable but often the cheapest form of electricity. Solar panels have a lifespan of roughly 30 years, and come in variety of shades depending on the type of material used in manufacturing.
WIND ENERGY
Wind energy harnesses the kinetic energy of moving air by using large wind turbines located on land (onshore) or in sea- or freshwater (offshore). Wind energy has been used for millennia, but onshore and offshore wind energy technologies have evolved over the last few years to maximize the electricity produced - with taller turbines and larger rotor diameters.
Though average wind speeds vary considerably by location, the world’s technical potential for wind energy exceeds global electricity production, and ample potential exists in most regions of the world to enable significant wind energy deployment.
Many parts of the world have strong wind speeds, but the best locations for generating wind power are sometimes remote ones. Offshore wind power offers tremendous potential.
GEOTHERMAL ENERGY
Geothermal energy utilizes the accessible thermal energy from the Earth’s interior. Heat is extracted from geothermal reservoirs using wells or other means.
Reservoirs that are naturally sufficiently hot and permeable are called hydrothermal reservoirs, whereas reservoirs that are sufficiently hot but that are improved with hydraulic stimulation are called enhanced geothermal systems.
Once at the surface, fluids of various temperatures can be used to generate electricity. The technology for electricity generation from hydrothermal reservoirs is mature and reliable, and has been operating for more than 100 years.
HYDROPOWER
Hydropower harnesses the energy of water moving from higher to lower elevations. It can be generated from reservoirs and rivers. Reservoir hydropower plants rely on stored water in a reservoir, while run-of-river hydropower plants harness energy from the available flow of the river.
Hydropower reservoirs often have multiple uses - providing drinking water, water for irrigation, flood and drought control, navigation services, as well as energy supply.
Hydropower currently is the largest source of renewable energy in the electricity sector. It relies on generally stable rainfall patterns, and can be negatively impacted by climate-induced droughts or changes to ecosystems which impact rainfall patterns.
The infrastructure needed to create hydropower can also impact on ecosystems in adverse ways. For this reason, many consider small-scale hydro a more environmentally-friendly option, and especially suitable for communities in remote locations.
OCEAN ENERGY
Ocean energy derives from technologies that use the kinetic and thermal energy of seawater - waves or currents for instance - to produce electricity or heat.
Ocean energy systems are still at an early stage of development, with a number of prototype wave and tidal current devices being explored. The theoretical potential for ocean energy easily exceeds present human energy requirements.
Give Scientific reason :Hydroelectric energy, solar energy and wind energy are called renewable energies.
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Question
Hydroelectric energy, solar energy and wind energy are called renewable energies.
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Hydroelectric energy, solar energy, and wind energy are called renewable energies because they are abundant in nature and can be regenerated or replenished again and again. These will never be extinct even with their excessive use.
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Give scientific reason Hydroelectric energy, solar energy and wind energy are called renewable energies.
Give scientific reason Hydroelectric energy, solar energy and wind energy are called renewable energies.
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Give scientific reasonHydroelectric energy, solar energy and wind energy are called renewable energies.
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SOLUTION 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.
Renewable energy is called renewable because it can be easily replenished without the help of a man.
There are several types of renewable energy that is used in different ways to make it usable to humans.
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.
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.
Sunlight, also known as solar energy, is also a common renewable energy source.
Sunlight is made useful to humans in the production of electricity by releasing electromagnetic radiation.
Once the electromagnetic radiation is captured, usually with the use of photovoltaic cells in a conductor material, it produces electricity and heat.
The conductor material ordinarily is silicon because of the abundance of the material.
The initial start-up costs for installing solar energy panels into a consumer’s home is 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.
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.
SOLUTION 2
The sources of energy which are being produced continuously in nature and are inexhaustible, i.e., they are always available for use are called renewable sources of energy.
Hydroelectric energy, solar energy, 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.
Concept: Hydroelectric Energy
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Chapter 5: Towards Green Energy - Exercises [Page 60]
Q 11.3 Q 11.2 Q 11.4
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Balbharati Science and Technology Part 2 10th Standard SSC Maharashtra State Board
Chapter 5 Towards Green Energy
Exercises | Q 11.3 | Page 60
2019-2020 (March) Set 1 (with solutions)
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