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= Concept Map =

= Concept Map =

<mm>[[alernative energy resource.mm|Flash]]</mm> __FORCETOC__

[[File:alernative energy resource.mm|Flash]] __FORCETOC__

= Textbook =

= Textbook =

= Additional information =

= Additional information =

A '''solar thermal collector''' collects heat by absorbing sunlight. A collector is a device for capturing solar radiation. Solar radiation is energy in the form of electromagnetic radiation from the infrared (long) to the ultraviolet (short) wavelengths. The quantity of solar energy striking the Earth's surface averages about 1,000 watts per square meter under clear skies, depending upon weather conditions, location and orientation.

A '''solar thermal collector''' collects heat by absorbing sunlight. A collector is a device for capturing solar radiation. Solar radiation is energy in the form of electromagnetic radiation from the infrared (long) to the ultraviolet (short) wavelengths. The quantity of solar energy striking the Earth's surface averages about 1,000 watts per square meter under clear skies, depending upon weather conditions, location and orientation.

The term solar collector commonly refers to solar hot water panels, but may refer to installations such as solar parabolic troughs and solar towers; or basic installations such as solar air heaters. Solar power plants usually use the more complex collectors to generate electricity by heating a fluid to drive a turbine connected to an electrical generator.[1] Simple collectors are typically used in residential and commercial buildings for space heating.

The term solar collector commonly refers to solar hot water panels, but may refer to installations such as solar parabolic troughs and solar towers; or basic installations such as solar air heaters. Solar power A solar cell (also called a photovoltaic cell) is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect. It is a form of photoelectric cell, defined as a device whose electrical characteristics—e.g. current, voltage, or resistance—vary when exposed to light.

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Cells can be described as photovoltaic even when the light source is not necessarily sunlight (lamplight, artificial light, etc.) Photovoltaic cells are used as a photodetector (for example infrared detectors), detecting light or other electromagnetic radiation near the visible range, or measuring light intensity.

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When solar energy is absorbed in the water, its temperature increases, causing thermal expansion and reduced density. If the water were fresh, the low-density warm water would float to the surface, causing a convection current. The temperature gradient alone causes a density gradient that decreases with depth. However the salinity gradient forms a density gradient that increases with depth, and this counteracts the temperature gradient, thus preventing heat in the lower layers from moving upwards by convection and leaving the pond. This means that the temperature at the bottom of the pond will rise to over 90 °C while the temperature at the top of the pond is usually around 30 °C. You can see solar lake in buch in gujarath.

When solar energy is absorbed in the water, its temperature increases, causing thermal expansion and reduced density. If the water were fresh, the low-density warm water would float to the surface, causing a convection current. The temperature gradient alone causes a density gradient that decreases with depth. However the salinity gradient forms a density gradient that increases with depth, and this counteracts the temperature gradient, thus preventing heat in the lower layers from moving upwards by convection and leaving the pond. This means that the temperature at the bottom of the pond will rise to over 90 °C while the temperature at the top of the pond is usually around 30 °C. You can see solar lake in buch in gujarath.

The heat trapped in the salty bottom layer can be used for many different purposes, such as the heating of buildings or industrial hot water or to drive an organic Rankine cycle turbine or Stirling engine for generating electricity.

The heat trapped in the salty bottom layer can be used for many different purposes, such as the heating of buildings or industrial hot water or to drive an organic Rankine cycle turbine or Stirling engine for generating electricity.

 

'''Biodiesel''' refers to a vegetable oil- or animal fat-based diesel fuel consisting of long-chain alkyl (methyl, ethyl, or propyl) esters. Biodiesel is typically made by chemically reacting lipids (e.g., vegetable oil, animal fat  with an alcohol producing fatty acid esters.

<br>'''Biodiesel''' refers to a vegetable oil- or animal fat-based diesel fuel consisting of long-chain alkyl (methyl, ethyl, or propyl) esters. Biodiesel is typically made by chemically reacting lipids (e.g., vegetable oil, animal fat  with an alcohol producing fatty acid esters.

Biodiesel is meant to be used in standard diesel engines and is thus distinct from the vegetable and waste oils used to fuel converted diesel engines.  

Biodiesel is meant to be used in standard diesel engines and is thus distinct from the vegetable and waste oils used to fuel converted diesel engines.  

===Activities===

===Activities===

==Estimated Time==

==='''Question Corner'''===

==Materials/ Resources needed==

[http://karnatakaeducation.org.in/KOER/en/index.php/'''Give the link of the page name from where activity was given''' Back]

==Multimedia resources==

=='''Concept #2wind energy'''==

==Website interactives/ links/ simulations==

===Learning objectives===

==Process (How to do the activity)==

# to know about the need of wind energy as alternative energy

# to learn the wind energy as the source non conventional energy

==Evaluation (Questions for assessment of the child)==

# to understand need of wind energy in a decentralized system

 

'''To link back to the topic page'''

[http://karnatakaeducation.org.in/KOER/en/index.php/'''Give the link of the page name from where activity was given''' Back]

#Activity No #2 '''page_name_concept_name_activity2'''

===Notes for teachers===

===Notes for teachers===

===Activities===

===Activities===

===Notes for teachers===

===Notes for teachers===

===Activities===

===Activities===

#Activity No #1 '''page_name_concept_name_activity1'''

#Activity No #1 '''page_name_concept_name_activity1'''{{subst:Science-Activity}

#Activity No #2 '''page_name_concept_name_activity2'''

#Activity No #2 '''page_name_concept_name_activity2'''

= Fun corner =

= Fun corner =