# CBSE Class 10 Science Sources Of Energy Notes Set B

CBSE Class 10 Physics Sources of Energy Notes. Learning the important concepts is very important for every student to get better marks in examinations. The concepts should be clear which will help in faster learning. The attached concepts made as per NCERT and CBSE pattern will help the student to understand the chapter and score better marks in the examinations.

CHAPTER – 14

SOURCES OF ENERGY

ENERGY: - Whenever a body is capable of doing work, the body is said to possess energy. Thus energy is defined as the ability of a body to do work and the amount of energy possessed by a body is equal to the amount of work it can do when its energy is released.

Energy comes in different forms and one form can be converted to another. For example, if we drop a plate from a height, the potential energy of the plate is converted mostly to sound energy when it hits the ground.

Units of energy: - On S.I. system, energy is measured in the units of joules or in calories, and on C.G.S. system in ergs. However, the commercial unit of energy is kilowatt-hour. The energy is said to be one kilowatt-hour, when a body consumes one kilowatt of energy in one hour.

Sources of energy : a source of energy is that which is capable of providing enough useful energy at a steady rate over a long period of time.

A good source of energy should be :

i) Safe and convenient to use, e.g., nuclear energy can be used only by highly trained engineers with the help of nuclear power plants. It cannot be used for our household purposed.
ii) Easy to transport, e.g., coal, petrol, diesel, LPG etc. Have to be transported from the places of their production to the consumers.
iii) Easy to store, e.g., huge storage tanks are required to store petrol, diesel, LPG etc.

Characteristics of an ideal or a good fuel:

ØIt should have a high calorific or a heat value, so that it can produce maximum energy by low fuel consumption.
ØIt should have a proper ignition temperature, so that it can burn easily.
ØIt should not produce harmful gases during combustion.
ØIt should be cheap in cost and easily available in plenty for everyone.
ØIt should be easily and convenient to handl Øe, store and transport from one place to another.
ØIt should not be valuable to any other purpose than as a fuel.
ØIt should burn smoothly and should not leave much residue after its combustion.

INTEXT QUESTIONS PAGE NO. 243

1. What is a good source of energy?
Ans. A good source of energy fulfils the following criteria:
· It produces a lot of heat per unit mass.
· It does a huge amount of work per unit mass.
· It is easily accessible.
· It is easy to store and transport.
· It is economical.
· It produces less amount of smoke.

2. What is a good fuel?

Ans. A good fuel produces a huge amount of heat on burning, does not produce a lot of smoke, and is easily available.

## Tags:

Click for more Physics Study Material

## Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

### The CBSE Science Challenge 2020

The CBSE Science Challenge - 2020 Science is inexplicably linked with our lives and helps us to understand the world around us better. Scientific and technological developments contribute to progress and help improve our standards of living. By engaging with this...

### Tricks for Utilization of additional time introduced in CBSE Board Exams

Tricks for Proper Utilization of Add-On 15 Minutes introduced in CBSE Board Exams The intend of this article is to share the best suggestions and guidelines to utilize the extra 15 minutes provided for reading the question paper in CBSE Board Examination. These extra...

### BRICS International Online Mathematics Competition

BRICSMATH.COM is an annual International Online Competition in Mathematics, for students of classes I – XII of 07 BRICS countries (Brazil, Russia, India, China and South Africa, Indonesia and Vietnam). The competition is held online on the website www.bricsmath.com and...

### Digital Marks Sheets Migration Certificates and Pass Certificates

CBSE pioneered in providing digital academic documents through its academic repository called “Parinam Manjusha” and DigiLocker.  As on now result data from 2004 till this year is available in the repository.  Approx. 12 crores digital academic documents are available...

### How to Effectively Answer CBSE Board Examination Question Papers

The intend of this article is to share the best ways to answer the CBSE Board Examination. Usually most of the students tend to become nervous at the times of the board examination. In this article we will share the most effective ways to make the answers to the CBSE...

×