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Energy - Coggle Diagram
Energy
Different types of energy and its uses
Electrical energy
Electrical energy helps us to use electrical appliances.
Examples of electrical energy
Ex. Power plug, CPR machine, home appliances
Why is it important?
If there is no electrical energy, there would be no light except for the sun and there would be no advances in technology.
Kinetic energy
Kinetic energy helps us to move.
Examples of kinetic energy
Ex. A moving train, waves, wind, a moving car
Why is it important?
If there is no kinetic energy, all of us cannot move.
Sound energy
Sound energy helps us to hear.
Examples of sound energy
Ex. Airplane turbines, piano, singing, horn
Why is it important?
If there is no sound energy, no one can hear and thus no one can talk.
Heat energy
Heat energy helps to make things warm.
Examples of heat energy
Ex. Oven, fire, Sun, hot soup
Why is it important?
If there is no more heat energy, the whole world would freeze and we would die.
Potential energy
Gravitational potential energy
Created when objects are placed above the ground.
Ex. Book on a shelf, Car on a ramp
Elastic potential energy
Created when objects are stretched or compressed.
Ex. Rubber band, Compressed spring
Chemical potential energy
Contains energy needed for daily work.
Ex. Food, Coal
Light energy
Light energy helps us to see.
Examples of light energy
Ex. Runway lights, phones, cameras, lighthouses.
Why is it important?
Plants rely on light to photosynthesize to make food. Without light, we would have no food to eat as all the plants die out.
Photosynthesis
Photosynthesis is when a plant traps sunlight to make food.
Plants trap food with the chlorophyll in the chloroplasts found in plant cells.
Photosynthesis equation
Water + Carbon dioxide -----light-----> Food + oxygen
Photosynthesis cannot happen in a dark room as there is no light present.
Photosynthesis only happens in the day as there is light.
Why do we need energy?
Living and non-living things require energy to work.
Energy enables us to carry out our daily activities.
We need energy for survival. (ex. the Sun)
Energy in food
Measured in kcal
All energy in food links to the Sun
Examples
Animal eats plants, which gets its food from the Sun.
Dairy products comes from animals, which eats plants, which gets its food from the Sun.
Vegetables comes from plants, which gets its food from the Sun.
The energy in food are sugar produced by the plants they come from.
Starch testing
We test for starch using Iodine solution.
When starch is present, the Iodine solution would turn from yellowish-brown to bluish-black.
Starch is the extra food made by the plant.
Starch could be present in products made from plants.
Respiration
Respiration is when a plant takes in oxygen and give out carbon dioxide.
Respiration happens all the time.
Energy cannot be created nor destroyed. It can only be converted from one form to another.
Sources of energy