Sources of Energy — Important Questions

Coal, Natural gas, Petroleum

Step 1: Fossil fuels are formed from the remains of dead plants and animals buried millions of years ago. Step 2: Under high temperature and pressure, these organic materials transformed into coal, natural gas, and petroleum. Step 3: Coal formed from decomposed plant matter in swampy conditions. Step 4: Natural gas and petroleum formed from marine organisms and plants. Step 5: Solar energy, wind energy, and biomass are renewable sources, not fossil fuels formed from ancient organisms.

False

Step 1: According to the Law of Conservation of Energy, energy can neither be created nor destroyed. Step 2: Energy can only be transformed from one form to another form. Step 3: For example, when we burn coal, chemical energy transforms into heat energy, not gets created. Step 4: The total amount of energy in the universe remains constant. Step 5: This fundamental law applies to all energy transformations in nature and technology.

Free of cost, Clean energy source, Renewable

Step 1: Wind energy is free because wind is a natural phenomenon that costs nothing to use. Step 2: It's clean because no harmful gases or pollutants are released during electricity generation. Step 3: Wind is renewable because it's created by solar heating of the atmosphere, which will continue as long as the sun shines. Step 4: However, wind is not always available - it depends on weather conditions and location. Step 5: Wind energy produces no pollution, making it environmentally friendly.

True

Step 1: Solar panels contain photovoltaic cells made of silicon semiconductors. Step 2: When sunlight hits these cells, photons knock electrons loose from silicon atoms. Step 3: This creates an electric current as electrons flow through the material. Step 4: This process directly converts light energy into electrical energy without any moving parts. Step 5: No heat or mechanical energy conversion is needed - it's a direct transformation from light to electricity.