Hello. Welcome to class. In this class, you will learn about energy.
Energy is “the ability to do work”. Energy is how things change and move. It’s everywhere around us and takes all sorts of forms. It takes energy to cook food, to drive to school, and to jump in the air. Energy makes things move. It makes machines work. Energy also makes living things grow.
Plants are important because it is how humans and animals get food. We get the energy we need by eating fruits, meats, and vegetables. When we eat food, we have the energy to do things we enjoy.
WHY DO WE NEED ENERGY?
We need energy because:
- it gives us heat
- it gives light
- it gives us movement
- it makes our computers work.
FORMS OF ENERGY
Energy exists in many different forms. Examples of these are: light energy, heat energy, mechanical energy, gravitational energy, electrical energy, sound energy, chemical energy, nuclear or atomic energy and so on
Wind energy refers to the kinetic energy created by the wind in order to produce wind power. Wind energy can be used for anything from power on boats, battery charging, or electricity
Kinetic energy is the energy an object has because of its motion. If we want to accelerate an object, then we must apply a force. Kinetic energy is the energy processed by an object in motion like a car in motion or football when kicked.
Light is a type of energy that makes it possible for us to see the world around us. We need light to see e.g Torchlight, lamp, sun.
Sound is a type of energy made by vibrations. Sound is created when something vibrates and sends waves of energy (vibration) into our ears. The vibrations travel through the air or another medium e.g trumpet, radio, megaphone, playing of instruments etc.
Heat energy is produced in so many ways such as burning, rubbing, or mixing one substance with another flows from hot objects to cool objects. It flows from one object to another because of their difference in temperature. The cool object absorbs the energy and becomes warmer. e.g microwave, oven, cooker, hairdryer
Chemical energy is the energy stored within chemicals. Examples are petroleum, gasoline, wood.
Electrical energy is a form of energy resulting from the flow of electric charge. Electricity is a type of energy that comes from the flow of electrical power, also known as a charge. Electricity is used to power our homes, lights and electronics.
EVALUATION
Identify the type of energy
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See you in the next class.
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