NCERT Activity 14.6 Class 10 Science | Sources of Energy class 10 science activities solutions

In this post, you are going to read NCERT activity 14.6 class 10 science, sources of energy. You will find a complete explanation of activity 14.6 class 10 science with a conclusion.

NCERT Activity 14.6 Class 10 Science | Sources of Energy
 

Activity 14.6 Class 10 Science

    ·     Study the structure and working of a solar cooker and or a solar water heater. Particularly with regard to how it is insulated and maximum heat absorption is ensured.

    ·     Design and build a solar cooker or water heater using low-cost material available and check what temperatures are achieved in your system.

    ·     Discuss what would be the advantages and limitations of using the solar cooker or water heater.

       

Explanation

A solar cooker uses solar energy to cook food. The solar cooker entraps the sun's rays and heat is trapped in it. This heat is used to cook food.

The solar cooker is made up of such types of materials that absorb maximum heat or solar energy. So first we look at the material used in making solar cookers.

i.    Glass covers – Two glass covers are provided to minimize heat loss.

ii.   Rubber strip – The loss of heat due to convection is minimized by making the box airtight with a rubber strip all around between the upper lid and the box.

iii.  Black metal tray - We know that a black body or object absorbs all sun rays and becomes hot. So, the metal tray is painted black from the inside.

iv.  Insulating material – Insulating materials like wool, and wood powder are filled in the space between the blackened tray and outer cover of the box.

So, this is how maximum heat absorption is ensured in a solar cooker.

The solar cooker is made up of low-cost materials. It is made up of inner and outer metal or wooden boxes with double glass sheets on them. The absorber tray is blackened. The top cover contains 3 mm thick two plain glasses fixed on a metal or wooden frame.

Approx 115°C to 125°Ctemperature is achieved inside the solar cooker.

Advantages of solar cooker

i.    The soler cooker is completely pollution-free

ii. It does not use any fuel.

iii.  The use of solar cookers saves money.

iv.  Nutrients of food do not get destroyed in it.

Limitations of solar cooker

i.   The solar cooker works on solar energy so it cannot be used at night or on cloudy days.

ii.    Chappaties cannot be prepared in it.

iii.  The direction of the reflector mirror has to be changed from time to time to keep it towards the sun.

   Related Topics - 

1. Next activity - Activity 14.7 Class 10 Science

2. Previous activity-  Activity 14.5 Class 10 Science

2. NCERT solutions of Chapter 14 

3. Extra Questions of Chapter 14