Energy is the ability to do work. Practically, energy is required to perform every activity or work that you do in your day to day life. Energy is also required for vehicles to move, machines to run, bulbs to glow, etc. Energy is very crucial for the existence of human beings. And it exists in various forms. Different forms of energy are electrical energy, tidal energy, light energy, chemical energy, gravitational energy and nuclear energy, heat energy. One form of energy can easily be transferred to another. In this section, we will learn about the law of conservation of energy, the conservation of energy formula and its derivation along with some examples.
Law of Conservation of Energy
According to the law of conservation of energy, the total energy of an isolated system remains conserved over time. In this definition, the isolated system refers to as a thermodynamic system so designed that no matter or energy can pass through it.
Real-Life Example
We can take the example of a windmill. The mechanical energy of wind rotates the turbines of a windmill, which in turn rotate the shaft of an electric generator, thus generating electrical energy. Here, we observe that the mechanical energy of wind gets converted into electrical energy.
Solved Examples
Example 1: The initial energy and the final energy of a system can be given by 2.95 × 10-3 and 5.86 × 10-3 respectively. Find the energy conservation of the system.
Example 2: A particle of charge equal to that of electron and the charge is 1.67 × 10-27 and mass of the particle is 1.30 × 10-27 kg. Compute the law of conservation of energy.
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