Solar energy is the radiation from the sun that can produce heat, cause chemical reactions, or generate electricity. It is the largest source of energy received on Earth, but its intensity at the surface is low. Solar energy is becoming an increasingly important energy source due to its non-polluting nature and inexhaustible supply, unlike fossil fuels which will be depleted. There are several methods to harness solar energy, including passive and active solar, photovoltaics, and solar thermal.

1.  It is the radiation from the sun that is capable of
producing heat, causing chemical reactions, or
generating electricity.
 It is the largest source of energy received on Earth,
but its intensity on the earth's surface is quite low.“
 Solar energy is rapidly becoming the ultimate energy
source because of its non-polluting character and its
inexhaustible supply which are in stark contrast to
such fossil fuel sources as coal, oil, and natural gas.

2.  Passive Solar Energy : The method in which solar energy is
harnessed in it’s direct form without using any mechanical
devices.
 Active Solar Energy : The method which implies mechanical
or electrical equipment for functioning and increase system
efficiency.
 Photovoltaic Solar Energy : Photovoltaic cells convert solar
energy into electrical energy this method is named as
Photovoltaic Solar Energy
 Solar Thermal Energy : Solar Thermal Energy is the heat
energy derived from incident solar energy, this energy is used
by the solar heating panels.

3.  Solar energy is free.
 Solar energy does not cause pollution.
 Solar energy can be used in remote areas where it is too
expensive to extend the electricity power grid.
 Many everyday items such as calculators and other low
power consuming devices can be powered by solar
energy effectively.
 It is estimated that the worlds oil reserves will last for
30 to 40 years. On the other hand, solar energy is
infinite (forever).

4.  Solar energy can only be harnessed when it is daytime and sunny.
 Solar collectors, panels and cells are relatively expensive.
 Solar power stations can be built but they do not match to
manufacture the power output of similar sized conventional
power stations. They are also very expensive.
 In countries such as the UK, the unreliable climate means that
solar energy is also unreliable as a source of energy. Cloudy skies
reduce its effectiveness.
 Large areas of land are required to capture the suns energy.
Collectors are usually arranged together especially when
electricity is to be produced and used in the same location.
 Solar batteries are large and heavy and need storage space. They
also need replacing from time to time.

5. • Cost Of Spam
1. 62 trillion spam messages in 2014
2. 0.3 grams of carbon dioxide (CO2) per
3. Annual spam energy use 33 Terawatt
Hours(tWh)
4. Equivalent to the electricity used in 2.4 million
homes a year
• The CO2 dissipated from sleeping devices 1/7th
the CO2 emitted by an automobile.
• Out of this electricity 66% of electricity is
produced by methods which are responsible for
serious CO2 emission such as Coal, Natural Gas,
etc.

6.  The green computing technologies can reduce energy consumption.
 The temperature of global world is increasing very quickly. There are many factors
but computers/electronics industry causes over emission of green house gas and use
much energy consumption which is the main root cause of current global warming.
 The energy consumption may be reduced by introduction of green computing.
 We can prepare and manufacture such devices which take low energy, give out low
heat and gases. Air stream, weather, medicine, transportation, agriculture uses
machines which take much amount of power, money and consumption of energy.
 It has been seen that there are three main areas which affect our daily life, air which
we breathe, water which we drink and food which we eat and the soil on which we
live.
 The data centers use a large amount of power/energy and release a lot of amount of
heat and gases. In our daily life we use AC’s. Refrigerators, inverters, UPS and
computers.

7.  Solar energy is also playing important role in green
computing. In this technology the emission of heat
 and different gases especially CO2 during producing
energy is very low. In solar computing cells are used in
 large panel. Solar cells require very little maintenance
throughout the life after installation. There is no further
 cost many years. So such solar powered devices are
manufactured that are totally non polluted, efficient, silent
 and highly reliable.
 Solar energy is echo friendly during the production of this
energy no toxic material or gases are
 evolved which harm atmosphere.

8.  Green computing using Solar Energy helps us
to reduce power consumption and heat.
 Currently, 75% of our electrical power is
generated by coal burning and nuclear power
plants and other pollution causing methods.
 Solar Energy is Eco-Friendly energy and
during the production of this energy no toxic
material or gases are evolved which harms
atmosphere.
 Pollution free indefinitely sustainable.

9.  https://www.slideshare.net
 https://www.researchgate.net
 https://www.wikipedia.com
 https://www.iosrjournals.org