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Supply to a House
The electric power line enters our house through three wires. One is called the earth wire or ground wire. This carries no electricity. The earth wire is connected to a large metal plate buried deep in the ground. The remaining two wires carry electricity. One of these is maintained at zero potenti..
Conditions for Chemical Change
The criterion for a chemical change is the production of one or more new substances. Therefore, certain conditions should be met in order to bring about a chemical change. The necessary conditions are: A minimum amount of energy needed to initiate a reaction (activation energ..
Types of Environmental Changes
Types of Environmental Changes - Environment of earth includes the whole of atmosphere, hydrosphere as related to biosphere. Therefore, environment includes nature, composition of air, characters of hydrological parameters, sunshine, air pressure, temperature, water resources - their stor..
Change in the Rainfall Patterns
The rainfall patterns in the world are governed by differential heating of air layers over different latitudes. Differential heating of air is the main reason for different convectional air current movement from one part of globe to other. The rainfall is associated with these ..
Internal Energy and Change in Internal Energy
Since chemical changes are always accompanied by energy changes, it indicates that reactants and products must be having certain amounts of energy. A fixed quantity of any substance is associated with a definite amount of energy, which depends upon chemical nature of t..
Hormonal Control of Cyclic Changes in Ovaries and Uterus During Menstrual Cycle
The cyclic changes in the ovary and uterus are under the control of estrogen and progesterone hormones whose secretion is under the control of gonadotropic hormones secreted by anterior pituitar..
The cyclic changes in the ovary and uterus are under the control of estrogen and progesterone hormones whose secretion is under the control of gonadotropic hormones secreted by anterior pituitar..Water for All
. There are some worrying facts about the water situation. The effects of world climate change are being all over including the Indian subcontinent. The increased temperature levels are resulting in changing weather patterns. For a country like India whose agricultural activitie..
Uses of ECG
In healthy individuals, the ECG remains reasonably constant, even though the heart rate changes with the demands of the body. The electrical activity of the heart shows changes under the following situations. a) Change in ionic environment of the heart b) A defect in t..
Heat engine is a device used for converting heat energy into mechanical energy.
There are two types of heat engines: external combustion engines and internal combustion engines. Steam engine is an example of external combustion engine. In such an engine, the fuel is burnt outside the working portion of the engine. A heat engine consists essentially of the following parts: i)..
There are two types of heat engines: external combustion engines and internal combustion engines. Steam engine is an example of external combustion engine. In such an engine, the fuel is burnt outside the working portion of the engine. A heat engine consists essentially of the following parts: i)..Experiment 1
Take a few pieces of ice in a beaker. Insert a thermometer. Note the temperature. You will observe it to be 0 0 C. Now place the beaker on a flame and heat it. Ice starts melting. As you supply heat to ice, its temperature should rise. But you will find that the temperature of ice remain..
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