46. Write a note on energy. for 6 marks
Answers
Answer:
The thing that make me angry is the continues noise. After coming to the home i want to rest and sleep for some time but if that time , any body or vehicle makes the noise i got very angry at that moment . Because i think there should have be a complete silent around when someone is resting.
Explanation:
nergy is the fundamental form of living for all living beings. There are different forms of energy on this planet. The Sun is considered as the elemental form of energy on the Earth. In Physics, energy is considered a quantitative property which can be transferred from an object in order for it to perform work. Hence, we can define energy as the strength to do any kind of physical activity. Thus, they say, "Energy is the ability to do work".
According to the laws of conservation of energy it states that “the energy can neither be created nor destroyed but can only be converted from one form to another”. The SI unit of energy is Joule. In this article, let us understand in detail about units of energy and different forms of energy.
Units of Energy
The International System of Units of measurement of energy is Joule. The unit of energy is named after James Prescott Joule. Joule is a derived unit and it is equal to the energy expended in applying a force of one newton through a distance of one meter. However, energy is also expressed in many other units not part of the SI, such as ergs, calories, British Thermal Units, kilowatt-hours, and kilocalories, which require a conversion factor when expressed in SI units.
Energy Conversion: Transfer and Transform
We know the energy can be transferred from one form to another, the movement of energy from one location to another is known as energy transfer. We notice various energy transformations happening around us.
Following are the four ways through which energy can be transferred:
Mechanically – By the action of force
Electrically – Electrically
By Radiation – By Light waves or Sound waves
By Heating – By conduction, convection, or radiation
The process which results in the energy changing from one form to another is known as energy transformation. While energy can be transformed or transferred, the total amount of energy does not change – this is called energy conservation.
Although there are many forms of energy, it is broadly categorized into:
1. Kinetic Energy
2. Potential Energy