Batteries come in all shapes and sizes. They store electrical charge and as we all know when they are put into an electronic device such as a portable radio, they provide the power. The usual battery sizes are seen opposite. These are the type used in school projects and range from 1.5 volts to 9 volts.
School projects are powered by batteries because they are safe, easily bought and safe.
School projects are powered by batteries because they are safe, easily bought and safe.
QUESTION
This shows one of the most simple circuits. When the switch is pressed, the LED (further information below) lights. Resistors are used in circuits because LEDs can be destroyed by voltages over 3 volts. Why do you think the circuit opposite does not have a resistor to protect the LED ?
ANSWER
Each battery is 1.5 volts. The two batteries are connected in ‘series’, they are both linked positive to negative and this gives us a total of 3 volts. Therefore, the LED is safe from damage.
THE LED
Light Emitting Diodes (LED) are very rugged, they last a very long time and they are an optical source. (A LIGHT SOURCE)
LEDs produce red, green, yellow, or orange light. They are used in a range of products. Can you name any ?
Infrared LEDs are also available although light from this type cannot be seen by the human eye. These are used in security devices.
LEDs are part of the diode family, consequently they must be connected the right way round or current will not pass through. They are usually protected by a resistor. (See DIODE information sheet).
LEDs produce red, green, yellow, or orange light. They are used in a range of products. Can you name any ?
Infrared LEDs are also available although light from this type cannot be seen by the human eye. These are used in security devices.
LEDs are part of the diode family, consequently they must be connected the right way round or current will not pass through. They are usually protected by a resistor. (See DIODE information sheet).
A SELECTION OF THE MOST POPULAR COLOURS
ENLARGED LED - NOTICE THE LONG AND SHORT LEG
Also Know How Swiches Works
Do you have any query or doubts,want to know that PLEASE ask it or leave your ideas at comment..or Just mail me:
MAil Me Your Query or Comments::
Friends,If you find anything incorrect here,PLEASE just inform me,to rectifies it !!!!!!!
0 comments:
Post a Comment