(a) What is geothermal energy?
(b) What is the source of heat contained in geothermal energy?
(c) Explain how, geothermal energy is used to generate electricity.
(d) State two advantages of geothermal energy.
(e) State two disadvantages of geothermal energy.
(a) Geothermal energy is the heat energy obtained from hot rocks present inside the earth due to the fission of radioactive materials in it.
(b) The hot rocks present below the surface of the earth are the sources of the heat contained in geothermal energy.
(c) The extremely hot rocks present below the surface of the earth, heat the underground water and turn it into steam. As more and more steam is formed between the rocks, it gets compressed to high pressures. Therefore, a hole is drilled into the earth up to the hot rocks and a pipe is put into it so that the steam present around the rocks comes up through the pipe at high pressure, and can run the turbine of a generator. Thus, electricity is produced.
(d) Two advantages of geothermal energy are as follows:
1. It is very economical to use.
2. It does not cause any pollution.
(e) Two disadvantages of geothermal energy are as follows:
1. It is not available everywhere, rather available only in areas where there are hot rocks near the surface of the earth.
2. Deep drilling into the earth is required to obtain geothermal energy, which is technically very difficult and expensive.
Related Articles
- How can one tap Geothermal Energy?
- Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun’s energy?$(a)$ geothermal energy$(b)$ wind energy$(c)$ nuclear energy$(d)$ bio-mass.
- Most of the sources of energy that we use represent stored solar energy. Which of the following is not ultimately derived from the sun's energy?(a) wind energy (b) geothermal energy(c) fossil fuels(d) biomass
- Which of the following sources of energy are not derived from the sun?Biomass, Wind, Ocean thermal energy, Geothermal energy, Nuclear fuels, Hydroelectricity, Wave energy, Coal, Petroleum, Tidal energy.
- (a) What are the advantages of nuclear energy?(b) State the disadvantages of nuclear energy?
- (a) What is wind? What type of energy is possessed by wind?(b) Explain how, wind energy can be used to generate electricity. Illustrate your answer with the help of a labelled diagram.(c) State two advantages of using wind energy for generating electricity.(d) Mention two limitations of wind energy for generating electricity.
- (a) Explain how tidal energy can be used to generate electricity?(b) Why is tidal energy not likely to be a potential source of energy?
- Answer question numbers 3 (a) to 3 (d) on the basis of your understanding of the following paragraph and the related studied concepts.Geothermal energy is the energy produced by the heat of molten rocks formed in the deeper hot regions of the earth’s crust. This energy is harnessed to generate electricity. When water is made to flow deep underground in the rocks it returns as steam (or hot water, which is later converted to steam) to drive a turbine on an electric power generator.In India, exploration and study of geothermal fields started in 1970. The Geological Survey in India has identified 350 geothermal energy locations in the country. The most promising of these is in the Puga valley of Ladakh. The estimated potential for geothermal energy in India is about 10000 MW. There are seven geothermal provinces in India namely the Himalayas, Sohna, West coast, Cambay, Son-Narmada-Tapi; Godavari, and Mahanadi. Most power stations in India produce Alternating Current (A.C).(a) What are geothermal energy hot-spots?(b) Name two countries, other than India, where power plants based on geothermal energy are operational.(c) Name the phenomenon that explains the working of an electric generator.(d)State an important advantage of using AC over DC.
- What is a source of energy? What are the two main categories of the sources of energy?
- Which of the following energy change involves frictional force? (a) chemical energy to heat energy(b) kinetic energy to heat energy(c) potential energy to sound energy (d) chemical energy to kinetic energy
- What is meant by ocean thermal energy? Explain how ocean thermal energy can be used to generate electricity.
- Geothermal energy is produced by the:(a) fission of radioactive materials(b) burning of coal inside the coal mines(c) combustion of natural gas deep inside the earth(d) fusion of radioactive substances
- What is meant by a renewable source of energy? Give two examples of renewable sources of energy.
- What is meant by a non-renewable source of energy? Give two examples of non-renewable source of energy.
- Name the devices or machines which convert:(a) Mechanical energy into electrical energy.(b) Chemical energy into electrical energy.(c) Electrical energy into heat energy.(d) Light energy into electrical energy.(e) Electrical energy into light energy.
Kickstart Your Career
Get certified by completing the course
Get Started
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies