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Updated on : 2022-09-05
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Study the various instances of transformation of energy class 12 physics CBSE
Study the various instances of transformation of energy you see around you and discuss them in class
Study the various instances of transformation of energy you see around you and discuss them in class.
Answer Verified 153.9k+ views 17 likes
Hint – To identify instances of transformation of energy in daily life, we start off by understanding what energy transformation means. Transformation of energy means the transfer of one form of energy into a different form.
Complete step-by-step solution -
The first law of thermodynamics or the law of conservation of energy states that energy can neither be created nor destroyed, it can only be converted from one form into another form.
The various instances of transformation of energy we see around us are as follows:
1). Electrical energy to mechanical/kinetic energy observed in a fan or any kind of motor. A fan uses electrical energy and converts it into mechanical energy using the motor it has, which makes the blades rotate.
2). Solar energy to electrical energy observed in solar panels. A solar panel is exposed to light coming from the sun, it stores this solar energy and it is transformed into electrical energy used in households etc.
3). Electrical energy to sound energy observed in speakers, headphones. Speakers use the electric input and convert them into the sound which comes out of it.
4). Electrical energy to heat energy observed in an oven. Oven derives electrical energy from the input and uses it to produce heat which is used to heat food.
Note – In order to answer these types of questions the key is to know the meaning/definition of the term ‘energy’. Also the fact that the total energy of a process always remains constant. The term ‘Energy’ in physics means the capacity to do work. There are various forms of energy such as potential energy, kinetic energy, thermal energy, electrical energy, chemical energy, nuclear energy and so on. The SI unit of measurement of energy is ‘Joule’.
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Study the various instances of trasnformation of energy you ?
Study the various instances of trasnformation of energy you see around you and discuss them in class. - 308375
Study the various instances of trasnformation of energy you see around you and discuss them in class.
2 Answers Jagat Prabhu
The conservation of energy principle states that energy can neither be destroyed nor created. Instead, energy just transforms from one form into another. So what exactly is energy transformation? Well, as you might guess, energy transformation is defined as the process of changing energy from one form to another.
There are so many different kinds of energy that can transform from one form to another. There is energy from chemical reactions called chemical energy, energy from thermal processes called heat energy, and energy from charged particles called electrical energy. The processes of fission, which is splitting atoms, and fusion, which is combining atoms, give us another type of energy called nuclear energy. And finally, the energy of motion, kinetic energy, and the energy associated with position, potential energy, are collectively called mechanical energy.
That sounds like quite a lot, doesn't it? Well it is, but don't worry, it's actually all pretty easy to remember. Next, we'll explore all of these kinds of possible transformations in more detail.
Different Types of Energy Transformations
Chemical energy is the energy stored within a substance through the bonds of chemical compounds. The energy stored in these chemical bonds can be released and transformed during any type of chemical reaction.
Think of when you're hungry. When you eat a piece of bread to satisfy this hunger, your body breaks down the chemical bonds of the bread and uses it to supply energy to your body. In this process, the chemical energy is transformed into mechanical energy, which you use to move, and which we'll cover in more detail in a moment. It also transforms it into thermal energy, which is created through the metabolic processes in your body to generate heat. Most of the time, chemical energy is released in the form of heat, and this transformation from chemical energy to heat, or thermal energy, is called an exothermic reaction.
Next, there are two main types of mechanical energy: kinetic energy and potential energy. Kinetic energy is the energy associated with the motion of an object. Therefore, any object that moves has kinetic energy. Likewise, there are two types of potential energy: gravitational potential energy and elastic potential energy. Gravitational potential energy is associated with the energy stored by an object because of its location above the ground. Elastic potential energy is the energy stored by any object that can stretch or compress. Potential energy can be converted to kinetic energy and vice versa.
For example, when you do a death-defying bungee jump off of a bridge, you are executing a variety of energy transformations. First, as you prepare to jump, you have gravitational potential energy - the bungee cord is slack so there is no elastic potential energy. Once you jump, you convert this gravitational potential energy into kinetic energy as you fall down. At the same time, the bungee cord begins to stretch out. As the cord stretches, it begins to store elastic potential energy. You stop at the very bottom when the cord is fully stretched out, so at this point, you have elastic potential energy. The cord then whips you back up, thereby converting the stored elastic potential energy into kinetic energy and gravitational potential energy. The process then repeats.
Electrical energy is the energy carried by charged particles as they move around a conductor. A perfect example of electrical energy being released is during a lightning storm. A lightning strike on a tree is an example of electrical energy being transformed into heat or thermal energy. The tree becomes hot and may even burn as a result of the electrical discharge.
Chemical energy can also be converted into electrical energy. For example, the chemical energy in a battery is converted into electrical energy. The electrical energy, which involves the motion of electrical charges or currents, can be used to power everyday devices like computers and flashlights.
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