Energy

key notes :

Definition of Energy:

• Energy is the ability to do work or cause changes.

Forms of Energy:

• Kinetic Energy: Energy of moving objects (e.g., a rolling ball).

• Potential Energy: Stored energy (e.g., water in a dam, a stretched rubber band).

• Light Energy: Energy from sources like the sun or a bulb.

• Heat Energy: Energy that causes objects to feel warm.

• Sound Energy: Energy that travels through air and can be heard.

• Electrical Energy: Energy used to power devices like lights and appliances.

Sources of Energy:

• Natural Sources: Sun, wind, water, and fossil fuels.

• Man-Made Sources: Batteries, generators.

Uses of Energy:

• To power machines and vehicles.
• To cook food and provide light.
• To run household appliances like fans and televisions.

Energy Transformation:

• Energy can change from one form to another (e.g., electrical energy to light energy in a bulb).

Renewable vs. Non-Renewable Energy:

• Renewable Energy: Sources that can be replenished (e.g., solar, wind, water).
• Non-Renewable Energy: Limited sources like coal, oil, and natural gas.

Importance of Conserving Energy:

• Conserving energy helps save resources and protects the environment.
• Simple ways to conserve energy include turning off lights when not in use and using energy-efficient appliances.

Interesting Facts About Energy:

• The sun is the primary source of energy for Earth.
• Energy is never created or destroyed, only transferred (Law of Conservation of Energy).

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