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DISASTER MANAGEMENT

Disaster management

Bridge rectifier

 

 

What make electric charge to flow ?

Potential difference or difference of electric pressure makes the electric charge to flow.

Let we can make it clear ,charges do not  flow in a copper wire by themselves ,just as water in a perfectly horizontal tube does not flow .We know that if two vessels containing water to different levels are joined together the water flows from the vessels containing water a t a higher levels to the lower level. there is a pressure difference between the two ends. This flow of water continues, till both the vessels have water at the same level.Thus ,in flow of the water from one vessel to the other ,the direction of flow of water is determined by the level of water in the vessels. In a similar manner  if the two charged conductors are joined  by a metal wire ,the direction of flow of  electron is determined by a quantity called the potential of the conductor. The gravity has no role to play in the case of charge flow.The electrons moves only if there is potential difference.

what is an led ?

What is an LED ?
   
                           We all now a days came to hear  about led bulb,tubes etc. LED is the short form of light emitting diode.It is a PN junction diode which works on forward bias. By changing the semiconductor material from which the LED is made, we can change the color of the light emitted.It uses less power than any other electric bulb.there are different types of leds that is unicolour multicolour,surface mount ,high power leds etc. the invention of led had made a drastic change in the filed of electronic. Today we can see these leds on each and every electronic gadgets, home appliances, vehicles etc.
Now we can take a look on LED voltage ranges and colours

LED symbol

simple LED circuit diagram