Form 1 Chapter 6 >>> Sources of Energy

Here is some important part in Chapter 6, students can have a review here^^
6.1   The Various Form and Sources of Energy

- Energy is defined as the ability to do work. Energy is measured in joules (j).

- Energy can be found in many forms :

a) Kinetic Energy

• Kinetic energy is the energy possessed by a moving object.
• The kinetuc energy of an object depends on ots mass and velocity.

example of kinetic energy-running of leopard

b) Potential Energy

• Potential energy is the energy stored in a body due to its position (gravitational potential energy) or its physical condition (elastic potential energy).
• The gravitational potential energy of an object depends on : the mass of the object, the distance of the object from the Earth's surface, and the power of the gravitational pull on the object.
• A falling object gain kinetic energy but loses potential energy.
• Elastic potential energy exists in only elastic substances such as spring or a rubber.

elastic potential energy

c) Heat Energy

• Heat energy is the energy that is stored in hot object.
• The heat energy of a body depends on its temperature and volume.

Heat Energy

d) Light Energy

• Light energy is the energy produced by an object that emits light.
• Light energy can travel in a vacuum and in a straight line in the form of waves.

example of light energy

e) Sound Energy

• Sound energy is the energy produced by a vibrating object.
• The vibrating air forms sound waves.

example of sound energy-drum

f) Chemical energy

• Chemical energy is the energy stored in a chemical substance.
• When substance undergoes chemical reaction, chemical energy which is stored will be released and converted into other form of energy.

example of electrical energy-battery

g) Electrical Energy

• Electrical energy is the energy produced by the flow of electric charges

example of electrical energy

h) Nuclear Energy

• Nuclear energy is the energy stored in the nucleus of an atom.
• Also known as atomic energy.

example of neclear energy-nuclear plant

i) Mechanical Energy

• Mechanical energy is produced when a machine or object change its position.

example of mechanical energy-used in meter glass

j) Solar Energy

• Solar energy is produced during the process of nuclear fusion in the Sun's core.
• Almost all the energy currently available comes from the Sun.

Solar energy comes from Sun

Sources of Energy
Types of energy source on Earth

• Fossil fuels
• Biomass fuel
• Radioactive substance
• Mechanical sources
• Geothermal sources
• Sun

6.2   Renewable and Non-Renewable Energy Source

• Renewable energy source of energy are energy sources which can be used again because the supplies are not limited. Example : wind, solar, hydro, wave, biomass, etc.
• Non-renewable energy sources of energy are sources of energy which are limited in supply and will be used up in a short period of time. Example : fossil fuels and radioactive souurces.