Energy
What is Energy?
key notes :
- Energy is the ability to do work or make things happen.
- It’s what makes things move, light up, and change.
- We use energy for everything we do, like running, playing, and even thinking!
Types of Energy:
- Kinetic Energy: This is the energy of motion. For example, when you ride a bike, your body has kinetic energy.
- Potential Energy: This is stored energy. For example, a ball at the top of a hill has potential energy because it can roll down and move.
- Heat (Thermal) Energy: This is the energy that makes things warm or hot. The Sun gives us heat energy.
- Light Energy: Light is a type of energy that helps us see. It comes from sources like the Sun or a lightbulb.
- Sound Energy: Sound is a type of energy that we hear when something vibrates, like when you clap your hands or play music.
Sources of Energy:
- The Sun: It gives us light and heat energy.
- Fossil Fuels (like coal, oil, and natural gas): These are used to make electricity and power cars, but they can harm the environment.
- Wind: Wind turbines use wind energy to make electricity.
- Water (Hydropower): Dams and waterfalls can be used to generate electricity.
- Batteries: They store energy to power things like toys and devices.
Saving Energy:
- Turn off lights when you leave a room.
- Unplug chargers and devices when you’re not using them.
- Use energy-efficient appliances and light bulbs.
- Walk, bike, or carpool instead of always using a car.
- Energy can’t be created or destroyed; it can only change from one form to another (Law of Conservation of Energy).
- The cheetah is the fastest land animal, and it has a lot of kinetic energy when it runs.
- Solar panels can turn sunlight into electricity for homes and buildings.
- When you eat food, your body turns it into energy for you to use.
Fun Energy Facts:
Energy is the ability to do work.
Energy is also required to change matter. Energy is required to change ice to water, or water to steam, or wood to smoke and ash.
Forms of Energy
There are many forms in which we get energy. Some of these are as follows.
- Heat energy is used to cook food. It also changes water to steam, and make steam engines move.
- Light energy helps us to see things. Plants use light energy to make food.
- Electrical energy is used in our homes and many other places. It runs the washing machine, refrigerator, geysers, electric flat iron and many other appliances in our house.
Sound energy: Sound energy from a loud thunder can make the windowpanes in our house rattle.
let’s practice! 🖊️
