Stretching a rubber band is the best example of increasing an object's potential energy because when a rubber band is stretched, work is done to store potential energy in the stretched rubber band. The potential energy is stored in the form of elastic potential energy, which is released when the rubber band is allowed to return to its original shape. This is a clear example of increasing an object's potential energy through the application of external force.
All of the given options involve the process of burning a substance, which is a chemical reaction that releases energy in the form of heat. When coal is burned at a power plant, gasoline is burned in a car engine, or charcoal is burned in a barbeque pit, the chemical energy stored in these substances is converted into thermal energy, resulting in the production of heat. Therefore, all of the options mentioned involve the conversion of chemical energy to thermal energy.
Wind power has a large amount of installed grid-interactive renewable power capacity in India. This is because India has favorable wind conditions in many regions, making it a suitable choice for harnessing renewable energy. Wind power projects have been implemented extensively across the country, leading to a significant installed capacity. Additionally, the Indian government has also provided incentives and policy support to promote wind power generation, further contributing to its large capacity.
The energy in biomass, wind, solar energy, and fossil fuels originally came from the sun.
Silicon solar cells are known for their high efficiency in converting sunlight into electricity. However, even the best silicon solar cells have limitations due to factors like reflection and heat dissipation. The given answer of 25% suggests that the best silicon solar cells can convert 25% of sunlight into electricity, indicating that they have a relatively high efficiency compared to other options.
Biogas is primarily composed of methane, which is a flammable gas and the main component responsible for its energy content. Methane is produced through the anaerobic decomposition of organic matter, such as animal waste, sewage, or agricultural residues. Carbon dioxide is also present in biogas, along with small amounts of other gases like nitrogen and hydrogen. However, methane is the dominant component, making up a significant portion of the biogas composition.
Hydro energy is not under the Ministry of New and Renewable Energy. The Ministry of New and Renewable Energy in India is responsible for the development and deployment of renewable energy sources such as wind energy, solar energy, and tidal energy. However, hydro energy, which refers to the generation of electricity from flowing or falling water, is typically managed by separate entities such as the Ministry of Power or the Ministry of Water Resources.
Termites could potentially help us produce biofuels because they have a unique ability to break down cellulose, a complex carbohydrate found in plant material. This process, known as cellulose digestion, allows termites to extract energy from wood and other plant-based materials. Scientists are studying the enzymes and microorganisms involved in termite digestion to develop more efficient and cost-effective methods for converting plant biomass into biofuels.
The Indian Renewable Energy Development Agency (IREDA) has the motto "ENERGY FOREVER." This indicates that IREDA is focused on promoting and developing renewable sources of energy in India. The motto suggests a commitment to sustainable energy solutions that can be used indefinitely without depleting natural resources.
A solar cell is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect. This effect occurs when photons from sunlight hit the solar cell and transfer their energy to electrons in the semiconductor material of the cell. This causes the electrons to become energized and creates an electric current. The photovoltaic effect is the fundamental principle behind the operation of solar cells and allows them to generate electricity from sunlight.
Renewable resources are limited by cost, but not supply. This means that while the availability of renewable resources is not a concern, their utilization may be restricted by the expenses involved in harnessing and using them. In contrast, nonrenewable resources may be more abundant than renewable resources, but they are not considered cleaner due to their environmental impacts. Therefore, the correct answer is that renewable resources are limited by cost, but not supply.
