Energy is the ability to do work or cause change and exists in various forms such as kinetic, potential, thermal, chemical, and electrical energy.
It is a fundamental concept that plays a crucial role in our daily lives and the natural world. Understanding energy is essential because it helps us comprehend how things move, how machines operate, and how living organisms function.
Sources of Energy
Understanding energy helps us comprehend how things work and how to use energy efficiently.
Type of Energy
Similarly, batteries store energy due to the chemicals they contain. The chemical reactions within a battery generate an electric current
Elastic objects, such as springs or rubber balls, naturally return to their original size and shape. Stretching or squashing them causes them to store energy.
Moving objects store energy known as kinetic energy. Energy due to movement is termed kinetic energy.
Raising an object to a higher position stores energy similarly to how stretching an elastic band requires effort. Lifting heavy objects also stores energy.
A dam holding back water creates a high-level lake that stores energy. This stored energy can be used to generate electricity, known as hydroelectricity.
Examples of work:
Examples of energy transfer by light and sound:
Electricity transfers energy from a battery or power station to electrical devices, enabling them to:
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Chapter Notes: Energy
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1. What is energy at work? | ![]() |
2. How is energy dissipated in a system? | ![]() |
3. What are some examples of energy dissipation in everyday life? | ![]() |
4. How can energy dissipation be reduced in a system? | ![]() |
5. Why is it important to consider energy dissipation in engineering design? | ![]() |