Solar energy is the ultimate source of energy from millions of years and it is a renewable energy.

1. Better Methods for
Utilizing Sun power

2. SOLAR ENERGY
 Solar energy is the ultimate source of energy fromSolar energy is the ultimate source of energy from
millions of years and it is a renewable energy.millions of years and it is a renewable energy.
 This energy consists of radiant light and heat energyThis energy consists of radiant light and heat energy
from the sun.from the sun.
 Out of all energy emitted by sun only a small fraction ofOut of all energy emitted by sun only a small fraction of
energy is absorbed by the earth.energy is absorbed by the earth.
 Just this tiny fraction of the sun’s energy that hits theJust this tiny fraction of the sun’s energy that hits the
earth is enough to meet all our power needs.earth is enough to meet all our power needs.
 Using present solar techniques some of the solarUsing present solar techniques some of the solar
energy reaching the earth is utilized for generatingenergy reaching the earth is utilized for generating
electricity etc….electricity etc….
 Even then the energy demand met by using solarEven then the energy demand met by using solar
energy is very less.energy is very less.

3. PRESENT SCENARIO
• The fossil fuels are non renewable
sources so we can not depend on
them forever.
• Though nuclear energy is a clean
and green energy, there are
always some problems associated
with it.
• So the only option we have is
solar energy because it is a
nonpolluting and silent source of
electricity and also low
maintainence and long lasting
energy.

4. • We can use solar energy by converting it to electrical
energy . So we must use a device called solar panels
which can convert the light energy into electrical energy.
• Solar panel is a group of solar cells.
• Solar cells works on the principle of photoelectric effect.
PHOTOELECTRIC EFFECT
• When a light of certain frequency falls on the surface of
a metal , electrons will absorb the energy . If incident
light energy is greater than the work function(minimum
energy required to remove the loosely bound valence
electrons)of the metal ,then the photo electrons will be
emitted and the excess energy is converted to the
kinetic energy of electron.
How solar energy is used

5. Working of solar cells
• When solar panels are placed in the sunlight ,
photons will strike the surface and emits electrons.
• As a result electron hole pair is created in the solar
cell.
• When external circuit is connected to the solar cell ,
electrons flow in the circuit and the current is
generated.

6. USES OF SOLAR ENERGY

On an office building , roof areas can be covered with solar
panels

Remote buildings such as schools , communities can make
use of solar energy.

In developing countries , this solar panels are very much
useful.

Even on the highways , for every five kilometres ,solar
telephones are used.

7. Solar car
Solar heater Solar lights
Applications

8. BETTER WAYS OF USAGE
• Government should take measures and see that
solar lights are used as street lights in all the areas.
• We can place solar panels in the barren lands
instead of keeping it away uselessly.
• We can also keep these solar panels in the deserts ,
where we can make use of this energy with the help
of a rechargeable battery.
• Efficiency of solar panels depends on the range of
frequencies of light that strikes the surface . So they
can give higher efficiency if we split the light into
different frequency ranges and direct the beams onto
the cells tuned to these frequencies.

9. Dr. Chirinjeev Kathuria
Website: www.newgenpower.com/
Address: Working at Chicago, Illinois, USA
Thank You

10. Dr. Chirinjeev Kathuria
Website: www.newgenpower.com/
Address: Working at Chicago, Illinois, USA
Thank You