Anisah Afifah's Weblog

Energy

Posted on: April 9, 2014


Energy gives us the ability to do all kinds of things such as; write, walk, read and cook. There are eight different energies sorted into two groups which are Working Energy and Stored Energy. Below are different types of Working Energy:

  • Kinetic Energy

  • Light Energy

  • Heat Energy

  • Sound Energy

  • Electrical Energy

Here is the list of Stored Energy:

  • Chemical Energy

  • Potential Energy

  • Nuclear Energy

Potential Energy – An object has potential energy depending on its position and condition, for example:

  • A ball has potential energy when it balances on top of another ball because of its position.

  • A rubber band has potential energy when it is stretched because of its condition.

Heat Energy – Heat energy heats an object, with a cooler temperature, making it hot. Here are some examples of situations when objects release heat energy:

  • A pot filled with water is placed on a gas stove which had been turned on. The fire on the gas stove releases heat energy making the water in the pot boil after a few minutes.

  • When we rub our hands rapidly, heat energy will be released during this process, making our hands hot.

Heat Energy sometimes comes with light energy.

Light Energy – Light energy is released by things that give out light. Without light energy, we will not be able to see our surroundings. Examples of situations that give out light energy are listed below:

  • By turning on a torch, light energy will be released, allowing us to see around us.

  • If you light up a fire, light energy is released together with heat energy.

Electrical Energy – Electrical energy is the energy used to work an electrical circuit, for example:

  • When two pieces of wires are connected to a bulb and a battery, the battery will release electrical energy which would flow through the wires lighting up the bulb.

Kinetic Energy – Kinetic energy is the energy absorbed by moving objects. For example:

  • If we roll a ball across the floor, the ball will absorb kinetic energy as it goes.

  • A car moving down a hill absorbs kinetic energy as it goes down

When an object moves faster, more kinetic energy will be absorbed into the object. Here are some examples:

  • Two balls with the same size and weight were pushed. One ball was rolling faster than the other. The fast rolling ball absorbs more kinetic energy than the ball with a slower speed.

  • Two leaves were blown in the wind. Both leaves are at the same shape and size. One of it was floating faster than the other leaf. The leaf that was flying faster absorbs more kinetic energy.

When two things, with different sizes move together at the same speed, the larger object will absorb more kinetic energy. Below are some examples:

  • Two toy cars with different sizes were pushed across a table at the same time and speed. The larger car will absorb more kinetic energy than the smaller car.

  • When two different sized trolleys were pushed together at the same speed. The smaller trolley will absorb less kinetic energy than the larger trolley.

Sound Energy – Sound energy travels in a form of waves. Sound energy is released when a sound is made. Some examples are shown below:

  • When a piano is played, sound energy is released as music filled the air.

  • If you tap a table, tapping sound will be heard which means, sound energy is released every time the table is tapped.

When something vibrates, a sound is made and sound energy will be released for example,

  • If a piece of string is pulled tightly and plucked at the center, the string will vibrate making a sound. This shows that sound energy is released.

Chemical Energy – As a stored energy, Chemical energy are the energy that is stored inside something to be changed into other energies. The following list shows some examples of things that contains chemical energy:

  • Food contains chemical energy. For your body to move around, it uses the chemical energy from the food.

  • Batteries contain chemical energy. This stored energy will soon be used as electrical energy to work a circuit.

Nuclear Energy – Nuclear energy is released by elements like Uranium and Hydrogen. These element can release a lot of energy. Nuclear energy are released in many forms. One of the many forms is, Radioactive Rays. As air pollutants, Radioactive Rays may cause very serious illness.

Energies cannot be produced or destroyed. Therefore, energies can change from one state to another. Here are some examples:

  • A toaster oven – Electrical energy –> Heat energy + Light energy

  • An alarm clock – Chemical energy –> Kinetic energy + Sound energy

There are at least six sources of energy. The sources are listed below:

  • Solar

  • Wind

  • Wave

  • Biomass

  • Geothermal

  • Fossils

Solar – Solar panels are used to change heat to other energies for example, electrical energy.

Wind – Wind turbines are used to change kinetic energy to other energies.

Wave – Dams are usually used to change kinetic energy, from the waves, into electrical energy. Since hydro means water this type of electricity is also called as hydroelectricity.

Biomass – Biomass is the energy source from organic materials.

Geothermal – Geo is earth and Thermal means heat. Geothermal is the heat from deep inside the earth. Geothermal works by letting the steam from the heat turn a wind turbine in the factory.

Fossils – Fossils are made of the remains of dead plants and animal that died years ago. These energy sources are pressed under layers of soil for thousands of years.

These sources of energy are sorted into two groups called, Renewable Energy Sources and Non-Renewable Energy Sources. Renewable energy sources are sources of energy that can be renewed. Non-renewable sources of energy are energy sources that will be used up one day and cannot be renewed. Below are the lists of both categories.

Renewable Energy Sources:

  • Solar

  • Wind

  • Wave

  • Geothermal

  • Biomass

Non-Renewable Energy Sources

  • Fossils

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