Chapter 5 Towards Green Energy Solutions
Study Maharashtra Board Class 10 Science and Technology Part 2 Chapter 5 Towards Green Energy with complete textbook exercise solutions. Understand thermal, nuclear and hydroelectric power generation, wind and solar energy, energy conversion, environmental effects and the need to save energy. A chapter mind map is included on the final PDF page.
What Is Included in These Towards Green Energy Solutions?
These Class 10 Science 2 Chapter 5 solutions follow the Maharashtra Board textbook exercise and cover energy-source classification, conventional and non-conventional energy, thermal and nuclear plants, hydroelectric generation, wind turbines, solar photovoltaic cells and solar thermal power plants. The answers also explain advantages, limitations, environmental effects and scientific reasons.
The chapter focuses on the complete journey from an energy source to electricity. In many power plants, available energy first produces motion in a turbine, and the turbine drives a generator. A solar photovoltaic cell is different because it converts sunlight directly into DC electrical energy. Understanding these conversion steps makes it easier to draw schematic diagrams and compare power-generation methods.
Class 10 Science 2 Chapter 5: Main Topics
Power Plants
Trace energy conversion in thermal, nuclear and hydroelectric power stations.
Solar Energy
Compare solar photovoltaic generation with solar thermal electricity generation.
Green Energy
Understand renewable sources, their environmental benefits and their practical limitations.
Important Green Energy Concepts
Thermal and Nuclear Power
A thermal power plant burns fuel such as coal to heat water and create steam. In a nuclear plant, controlled fission supplies the heat. Steam rotates a turbine connected to a generator. Fossil-fuel plants cause air pollution and release greenhouse gases, while nuclear plants require strict control and safe radioactive-waste management.
Hydroelectric and Wind Energy
Stored water has gravitational potential energy. Falling water rotates a turbine and generator. Wind turbines similarly use the kinetic energy of moving air. Both sources are renewable, but suitable locations are limited, and large projects may still affect habitats, land use and local communities.
Solar Photovoltaic Energy
Solar cells convert radiation directly into DC electricity. Connecting cells in series increases potential difference, while parallel connections increase current. Panels and arrays provide the required output. An inverter changes DC into AC when electricity must operate common household equipment or enter the distribution grid.
Solar Thermal Power
Reflectors concentrate sunlight on an absorber. The resulting heat generates steam, which drives a turbine and generator. Unlike a photovoltaic cell, this method uses several energy-conversion stages and follows a turbine-based power-generation process.
Saving Energy
Even renewable installations require materials, land and investment. Avoiding waste reduces the demand for power generation and lowers environmental pressure. Switching off unused devices, choosing efficient appliances and using daylight sensibly are simple examples of energy conservation.
How to Use the Chapter 5 Solutions
- Identify the original energy source used in each power plant.
- Write every energy transformation in its correct sequence.
- Compare renewable and non-renewable sources using advantages and limitations.
- Practise labelled schematic diagrams of the required power plants.
- Use the mind map on the final page to revise the whole chapter.
Chapter 5 Mind Map for Quick Revision
The final page of the PDF contains a mind map connecting conventional sources, renewable energy, different power plants, energy transformations, environmental effects and energy conservation. Use it to recall the chapter after studying the detailed textbook answers.
Frequently Asked Questions
Select a question to read a brief explanation with an example.
What is green energy?
Why is energy from fossil fuels not considered green energy?
How does a solar photovoltaic cell generate electricity?
Why is an inverter used with solar panels?
Why must nuclear fission be controlled in a power plant?
Why are turbines different in different power plants?
What are the advantages and limitations of solar energy?
Why is saving energy necessary?
Where is the Chapter 5 mind map?
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