energy saving refrigerator

It is based on the Peltier effect. If a current is passed through a thermo- couple, heat is absorbed (or removed) at one junction and is evolved at the other junction of the thermo-couple. If the first junction is in a closed region, it can cool it. Such a refrigerator uses no motor or co..

A heat engine takes heat from a hot body, converts a part of it into work and rejects the rest to a cold body. A refrigerator also known as a heat pump, does the reverse operation. It takes an amount of heat Q 2 from a cold body, an amount of work W is done on it by the surrounding and th..

Judicious use of Energy - In order to live and enable ourselves to do everyday work we need energy. The prosperity of a country depends upon the availability of energy. Huge amount of electrical energy is used to run the air conditioners, cold storage and oth..

The stocks of fuels are limited and hence use of energy saving devices is a must. As far as possible use only renewable sources of energy. More efficient heating installations should be employed while cooking. Incomplete combustion of fuel results in wastage of fuel le..

Growing consumption and non renewablity fossil fuel necessitate the conservation of this natural resource of to help in this effort many measures have been advocated. 1) Use of oil should be minimized so as to save it for future use. Public transport should be used as far possible. 2) Mo..

. When a body sliding on a surface comes to rest due to friction, the organized motion of the body is converted to random motion of molecules in the body and on the surface. Since we cannot control the motion of individual molecules, we cannot convert this random motion completely back to organized..

is a natural gas. It is produced from animal, water and weeds and other plants. India comes first in developing and using biogas technology. It is cheap, non-polluting and labour-saving fuel. Biogas can be used for cooking, lighting, and in vehicles. Solar energy, wind en..

Question: Explain the three R's in the conservation of environment? Answer: The three R's refer to Reduce, Recycle and Reuse. Reduce: Use less electricity by switching off unnecessary lights and fans, save water by repairing leaky taps, do not waste food. Recycle: Materials mad..

Solar cells are expensive and are used only when supplying electricity becomes difficult. Solar cells are the devices where solar energy is directly converted into electricity. Solar cells are used in spacecrafts, radios, television, refrigerators, buoys and other navigation aid..

Following are the chief uses of ammonia: 1) Ammonia is used in the industrial preparation of nitric acid by Ostwald's process. 2) Fertilisers, such as ammonium sulphate, ammonium nitrate, ammonium phosphate, urea etc. are manufactured with the help of ammonia. 3) It is used in the manufacture of ot..