The Energy

The energy 

Before we begin explained about renewable energy there is information that you should know about the the energy .

What is energy ?

I notice that when I ask this question , they usually have trouble giving an exact definition.

And I must say it is not easy.

The scientific definition for energy would be something like: the capacity of a system to perform work.

why we need energy ?

We humans use energy to do some work.

We use energy for heating air and water.

We use energy for transportation of people and products by cars, trains, trucks and planes.

We use energy to produce food and products.

We use energy to illuminate houses and streets.

We use energy to watch TV, do our laundry, working on computers and surfing the internet.

At the moment you are consuming energy to read our post 

 what is the types of energy ? 

Energy appears in many forms in our daily life, like, kinetic or mechanical energy, electrical energy, heat radiation, wave energy, chemical energy and nuclear energy.

The total amount of energy is always conserved.

This means that if we want energy to work for us, we usually convert it from one form to another form.

An example is the electric motor, this is a tool in which we convert electrical energy into mechanical energy.

The unit of energy :

The unit of energy is joule (J)

Power is the energy per time and is expressed in watts (W).

1 watt is 1 joule per second.

1 kWh equals the energy of a power of 1 kW being used for 1 hour .

Thanks for paying attention

note:{ the next post will be about the first type of renewable energy and the most popular type 

          "the solar energy " and we will learn the tow types of solar energy } .