This chapter explains that energy is the power that makes everything work, from moving vehicles to lighting our homes. It exists in many forms like solar, wind, water, thermal, electrical, and mechanical energy. While renewable sources such as the sun, wind, and water never run out, non-renewable sources like coal, petrol, and diesel are limited and may get exhausted. Energy is vital for cooking, travelling, farming, industries, and communication, so we must conserve it by switching off unused lights, saving fuel, and using resources wisely. Saving energy today ensures a better future for all.
Key Points
Energy is the ability to do work – it makes everything move, run, or function.
Forms of Energy:
Solar energy → from the Sun, used in solar cookers, heaters, and to generate electricity.
Wind energy → from moving air, used in windmills to pump water or produce electricity.
Water energy (Hydropower) → fast-moving water turns turbines to generate electricity.
Thermal energy → heat energy (fire, coal, gas).
Electrical energy → runs fans, lights, TV, machines.
Mechanical energy → energy of movement (vehicles, machines).
Renewable energy: Sun, wind, water – can be used again and again.
Non-renewable energy: Coal, petrol, diesel – limited and can finish.
Conservation of energy: Switch off fans/lights when not in use, use public transport, save fuel.
Energy is very important for our daily life – cooking, travelling, lighting, communication, farming, and industries.
👉 👉 Energy is precious. We must use it wisely and carefully. Saving energy means saving the Earth’s resources for future generations.