• 3 months ago
Transcript
00:00Hi kids, today we will learn about different forms of energies, so let's start.
00:11We know if we apply force, only then some work is done, and to exert force we need energy.
00:20So energy produces force, and force does the work.
00:26We need energy to apply force to do any work.
00:32Nothing can happen without energy.
00:37Now let's learn various forms of energy.
00:41There are many forms of energy, and all forms of energy are capable of doing work.
00:49A special property of energy is that it can change from one form to another.
00:57We can convert one form of energy to another form by suitable instrument.
01:05Washing machine, what is it doing?
01:09It's converting the electrical energy into mechanical energy for washing clothes.
01:16Now let's learn different forms of energy one by one.
01:23Muscular energy, it is the kind of energy that all of us use to do any kind of work
01:32like walking, running, swimming, lifting weights.
01:39Any work we do, we use muscular energy.
01:44So it's the energy stored in the muscles of human beings and all other living beings.
01:51We can play, jump, or do any physical activity using this muscular energy.
02:00Now let's learn about heat energy.
02:05Heat is form of energy and is capable of doing work.
02:10You all see your mom cooking food.
02:14Which energy does your mom use to cook food?
02:19She uses muscular energy, of course, to prepare the food.
02:24But it's the heat energy that cooks the raw food into cooked food.
02:30It is the heat energy inside the microwave or oven that cooks or bakes the food for you.
02:41Heat energy is also used to make you feel comfortable inside your home when it's too
02:48cold outside.
02:51Heat energy is also used to iron your clothes, kids.
02:56James Prescott Jewell was an English scientist and one of the first persons to realize that
03:03heat is a form of energy.
03:05He also proved that energy can be changed from one form to another.
03:13Now let's learn energy of flowing or moving water.
03:20The flowing water has energy that can be used to do some useful work.
03:26Here is an example.
03:29In big dams, water is stored in big reservoirs.
03:34And from these reservoirs, water is thrown from big heights on turbines.
03:41This fast-falling moving water rotates the turbines, which in turn runs the generators
03:48that produce electricity.
03:52Energy of moving water is used since ancient times.
03:59Big logs of wood were thrown in water and the energy of flowing water was used to transport
04:06big logs of wood from one place to another.
04:10We can enjoy water rides and it's all because of the energy of moving water.
04:18Now let's learn about electrical energy.
04:23Our life these days is handicapped without electrical energy, as everything is running
04:30with electrical energy.
04:32All we have to do is to plug an appliance into electrical socket and switch it on.
04:39Fans, refrigerators, ACs, washing machines, elevators and just almost everything uses
04:48electrical energy.
04:52So it's one of the most important forms of energy nowadays.
04:56We convert heat energy into electrical energy.
05:02We convert solar energy into electrical energy.
05:08And we convert wind energy into electrical energy.
05:14We even convert nuclear energy into electrical energy because electrical energy is a source
05:22that we use the most.
05:24And our appliances again convert this electrical energy into the desired form of energy.
05:34Fan changes the electrical energy into mechanical energy.
05:39A mixie or a grinder converts the electrical energy into mechanical energy.
05:47An iron converts the electrical energy into heat energy.
05:53Music player converts the electric energy into sound energy.
06:00Now let's learn about wind energy.
06:05The moving air has energy called wind energy.
06:11The wind energy can be used for rotating the blades of a windmill.
06:16The windmill can be used for running a wheat grinding machine, pumping out water and for
06:23producing electricity.
06:27Now let's learn about solar energy.
06:30The energy produced by the sun is called solar energy.
06:36It reaches us in the form of light energy and heat energy.
06:42Light energy issued by the plants to make their own food with a process called photosynthesis.
06:51We feel warm on a sunny day due to the heat energy of the sun.
06:57Solar cookers use this solar energy to cook food.
07:03Solar water heaters use this solar energy to heat water.
07:08Solar furnaces, solar batteries, big solar power plants all use the solar energy in order
07:16to work.
07:19Now let's learn about chemical energy.
07:23Every substance is made up of some molecules and the molecules are further made up of atoms.
07:31And these atoms and molecules are joined together with some bonds and chemical energy is stored
07:38in the bonds between these atoms and molecules.
07:42When the bonds between these atoms break or join energy is released and this energy is
07:49called chemical energy.
07:53Let's see some examples.
07:56When we eat food, the complex molecules of food are broken down into simpler molecules
08:03and release this chemical energy.
08:06And this is the energy that we use to do our daily activities.
08:12Fossil fuels have stored chemical energy in it and it is released when the fuels are burnt
08:19inside the vehicle and that energy is used by the vehicle to run.
08:27Electric cell or electric battery have chemical energy stored in them and that chemical energy
08:36is converted into electrical energy.
08:40So kids, today we learned about different forms of energy.
08:45Now you may go ahead and take a quiz to learn more.
08:48Bye-bye.