NATIONAL SCIENCE

CONCOURS 2015

Shailesh Kumar CLASS 7th

RAJIV GANDHI NAVODAYA VIDYALAYA ,DEHRADOON PRESENTS

PROJECT ON

Uses of SOLAR ENERGY

What is solar energy ?Solar energy is the form of energy provided by Sun. The

sun is the biggest natural source of renewable energy to us. The demand for energy is ever increasing. Many of our energy sources are derived from the sun. Solar energy can be trapped from the Sun by solar cells and be used for many purposes.

Uses of Solar energy

• Naturally solar energy is used in the process of photosynthesis by plants.

• Solar energy can be used for commercial electricity generation.

• It is used to heat the water.• Solar energy is used for cooking food.• Solar energy is used to recharge the battery of small

appliances like calculator , Radio, watches and Street lights.• It is used to dry fruits ,vegetables, clothes etc.• It is a source of energy for satellites in the space.

Uses of Solar energy

Electricity production from Solar energy For electricity production from solar energy ,we need of following things-

Solar panel – It is the combination of solar cells or phovoltic- cells .It is used to

capture solar energy from Sun.

Solar controller - The solar controller looks after the batteries, preventing them from

being damaged. It does this by ensuring that the battery cannot be over charged

by the solar panel, and ensuring the battery cannot be over discharged by the low

voltage power supply to small appliances.

Battery - The battery stores the power generated by the solar panel until it is

required. The vast majority of small solar electric systems run at 12 volts.

Mains Inverter- Where mains voltage is required, a mains voltage inverter is required

to convert the electrical current from 12 volt direct current (DC) to mains voltage

alternating current (AC). This allows mains voltage appliances to be run from a

solar electric system.

Function of Solar electric system

Solar energy is trapped from the Sun by solar panels. This energy is

used to charge the battery . From the battery ,electricity is used to run

the appliances with the help of inverter. With the help of solar

controller small devices like LED bulbs can be run directly.

Solar cooker

Solar cooker is a box like device. its space is lined by black sheet here we keep food material. It is covered by glass sheet. Lid of solar cooker has a mirror. This mirror help to focus reflected rays of sun-light over food material kept in the space of box. We can placed solar cooker with food material inside in sun-light and after some time food is cooked by heat of sun-light reflected on it by mirror of solar cooker.

Types of solar cooker

Solar water heater Solar water heater system is used to heat the water by using heat of sun light. This system includes Solar collector and insulated tank. Solar collector is the combination of tubes laminated by solar panel. Solar collector is supplied by cold water and this water is heated by sunlight trapped by panels .Warm water is sent to insulated tank and used time to time whenever required. It helps us to save electricity.

Some Solar water heaters

Thanks Shailesh kumar

Class 7th Rajiv Gandhi Navodaya Vidyalaya Dehradoon