I have found many electronics beginners connecting LED directly to battery. They are not aware about the aftereffects of connecting LED to voltage source directly. LED get damaged if LED is directly connected to voltage source because of the high current that flows through the LED. Since the resistance of LED is very low, a large current will flow through the LED which will permanently damage the LED. To avoid this problem, we are using a current limiting resistor in series to the LED. Value of the current limiting depends on the type of LED. Normally resistors of 1K is connected as current limiting resistors. Circuit is done as shown in the following diagram.
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